Answer : Total no.of cases will be 6 x 6 x 6 = 216(because each die can have values from 1 to 6) Desired outcomes are those whose sum up to 5. Desired outcomes are (1, 1, 3), (1, 3, 1), ( 1, 2, 2),...
In a single throw of three dice, find the probability of getting
In a lottery, a person chooses six different numbers at random from 1 to 20. If these six numbers match with the six numbers already fixed by the lottery committee, he wins the prize. What is the probability of winning the prize in the game?
Answer : All numbers are different (given in question), this will be the same as picking r different objects from n objects which is ncr Here, n= 20 and r = 6(as we have to pick 6 different objects...
A combination lock on a suitcase has 3 wheels, each labeled with nine digits from 1 to 9. If an opening combination is a particular sequence of three digits with no repeats, what is the probability of a person guessing the right combination?
Answer : As repetition is not allowed total no.of cases possible is 9×8×7(because if one of the numbers occupies a wheel, then the other wheel cannot be occupied by this number, i.e. next wheel have...
Two dice are thrown. Find
(i) the odds in favor of getting the sum 6
(ii)the odds against getting the sum 7
Answer : Total outcomes are (1, 1), (1, 2), (1, 3), (1, 4), (1, 5), (1, 6), (2, 1), (2, 2), (2, 3), (2, 4), (2, 5), (2, 6), (3, 1), (3, 2), (3, 3), (3, 4), (3, 5), (3, 6), (4, 1), (4, 2), (4, 3),...
If 5/14 Is the probability of occurrence of an event, find
(i) the odds in favor of its occurrence
(ii)the odds against its occurrence
Answer : (i) We know that, If odds in favor of the occurrence an event are a:b, then the probability of an event to occur is Given, probability We know, probability a/a+b = 5/14 So, a = 5 and a+b...
If the odds against the occurrence of an event be 4 : 7, find the probability of the occurrence of the event.
Answer : We know that, If odds in favor of the occurrence an event are a:b, then the probability of an event to occur is , similarly, if odds are not in the favor of the occurrence an event are...
The odds in favor of the occurrence of an event are 8 : 13. Find the probability that the event will occur.
Answer : We know that, If odds in favor of the occurrence an event are a:b, then the probability of an event to occur is , which indirectly came from Probability of the occurrence of an event...
If 7/10 is the probability of occurrence of an event, what is the probability that it does not occur?
Answer : We know that, Probability of occurring = 1 - the probability of not occurring Given the probability of occurrence 7/10 Therefore, the probability of not occurrence = 1- 7/10 7/10...
If 5/14 Is the probability of occurrence of an event, find
(i)the odds in favor of its occurrence
(ii)the odds against its occurrence
Answer : (i) We know that, If odds in favor of the occurrence an event are a:b, then the probability of an event to occur is Given, probability = 5/14 We know, probability a/a+b 5/14 . So, a = 5...
If the odds against the occurrence of an event be 4 : 7, find the probability of the occurrence of the event.
Answer : We know that, If odds in favor of the occurrence an event are a:b, then the probability of an event to occur similarly, if odds are not in the favor of the occurrence an event are a:b,...
The odds in favor of the occurrence of an event are 8 : 13. Find the probability that the event will occur.
Answer : We know that, If odds in favor of the occurrence an event are a:b, then the probability of an event to Where, Total no.of desired outcomes = a, and total no.of outcomes = a+b Given a = 8,...
If 7/10 is the probability of occurrence of an event, what is the probability that it does not occur?
Answer : We know that, 7/10 Therefore, the probability of not occurrence Probability of occurring = 1 - the probability of not occurring Given the probability of occurrence 1-7/10 Conclusion:...
What is the probability that in a group of two people, both will have the same birthday, assuming that there are 365 days in a year and no one has his/her birthday on 29th February?
Answer : We know that, Probability of occurring = 1 - the probability of not occurring Let’s calculate for the probability of not occurring, i.e. probability such that both of them don’t have a...
What is the probability that an ordinary year has 53 Tuesdays?
Answer : We know that, Probability of occurrence of an event So, we want another Tuesday that to from that 1 day left(as there is only one Tuesday left after 52 weeks)An ordinary year has 365 days...
Tickets numbered from 1 to 12 are mixed up together, and then a ticket is withdrawn at random. Find the probability that the ticket has a number which is a multiple of 2 or 3.
Answer : We know that, Probability of occurrence of an event Desired output is picking a number which is multiple of 2 or 3. So, desire outputs are 2, 3, 4, 6, 8, 9, 10, 12. Total no.of desired...
A card is drawn at random from a well-shuffled pack of 52 cards. What is the probability that the card bears a number greater than 3 and less than 10?
Answer : We know that, Probability of occurrence of an event Desired output is a number greater than 3 and less than 10.Total no.of outcomes are 52 There will be four sets of each card naming A, 1,...
If a letter is chosen at random from the English alphabet, find the probability that the letter is chosen is
(i)a vowel
(ii)a consonant
Answer : (i) We know that, Probability of occurrence of an event Total possible outcomes are alphabets from a to z Desired outcomes are a, e, i, o, u Conclusion: Probability of choosing a...
In a single throw of two dice, determine the probability of not getting the same number on the two dice.
Answer : We know that, Probability of occurrence of an event (2, 1), (2, 2), (2, 3), (2, 4), (2, 5), (2, 6),Total outcomes are (1, 1), (1, 2), (1, 3), (1, 4), (1, 5), (1, 6), (3, 1), (3, 2), (3, 3),...
Three unbiased coins are tossed once. Find the probability of getting at most 2 tails or at least 2 heads
Answer : We know that, Probability of occurrence of an event Let T be tails and H be heads Total possible outcomes = TTT, TTH, THT, HTT, THH, HTH, HHT, HHH Desired outcomes are at least two heads or...
Three unbiased coins are tossed once. Find the probability of getting at least 2 tails
at least 2 tails Answer : We know that, Probability of occurrence of an eventLet T be tails and H be heads Total possible outcomes = TTT, TTH, THT, HTT, THH, HTH, HHT, HHH Desired outcomes are at...
Three unbiased coins are tossed once. Find the probability of getting at most 2 tails
Answer : We know that, Probability of occurrence of an event Total possible outcomes = TTT, TTH, THT, HTT, THH, HTH, HHT, HHHLet T be tails and H be heads Desired outcomes are at most two tails. So,...
Three unbiased coins are tossed once. Find the probability of getting exactly one tail
Answer : We know that, Probability of occurrence of an event Total possible outcomes = TTT, TTH, THT, HTT, THH, HTH, HHT, HHH Desired outcomes are exactly one tail. So, desired outputs are THH, HTH,...
Three unbiased coins are tossed once. Find the probability of getting exactly 2 tails
Answer : We know that, Probability of occurrence of an event Let T be tails and H be heads Total possible outcomes = TTT, TTH, THT, HTT, THH, HTH, HHT, HHH Desired outcomes are exactl two tails. So,...
If there are two children in a family, find the probability that there is at least one boy in the family
Answer : We know that, Probability of occurrence of an event Let B be Boy and G be Girl Total possible outcomes are BB, BG, GB, GG Our desired outcome is at least one boy. So, BB, BG, GB are desired...
In a lottery, there are 10 prizes and 25 blanks. Find the probability of getting a prize.
Answer : We know that, Probability of occurrence of an event Total no.of outcomes = 10+25 = 35 Desired outcomes are prizes. Total no.of desired outcomes = 10 Therefore, the probability of getting a...
An urn contains 9 red, 7 white, and 4 black balls. A ball is drawn at random. Find the probability that the ball is drawn is not white
Answer : We know that, Probability of occurrence of an event By permutation and combination, total no.of ways to pick r objects from given n objects is nCr Now, total no.of ways to pick a ball from...
An urn contains 9 red, 7 white, and 4 black balls. A ball is drawn at random. Find the probability that the ball is drawn is white or black
Answer : We know that, Probability of occurrence of an event By permutation and combination, total no.of ways to pick r objects from given n objects is nCr Now, total no.of ways to pick a ball from...
An urn contains 9 red, 7 white, and 4 black balls. A ball is drawn at random. Find the probability that the ball is drawn is red or white
Answer : We know that, Probability of occurrence of an event By permutation and combination, total no.of ways to pick r objects from given n objects is nCr Now, total no.of ways to pick a ball from...
An urn contains 9 red, 7 white, and 4 black balls. A ball is drawn at random. Find the probability that the ball is drawn is
Answer : We know that, Probability of occurrence of an event By permutation and combination, total no.of ways to pick r objects from given n objects is nCr Now, total no.of ways to pick a ball from...
An urn contains 9 red, 7 white, and 4 black balls. A ball is drawn at random. Find the probability that the ball is drawn is red
Answer : We know that Probability of occurrence of an event By permutation and combination, total no.of ways to pick r objects from given n objects is nCr Now, total no.of ways to pick a ball from...
A bag contains 4 white and 5 black balls. A ball is drawn at random from the bag. Find the probability that the ball is drawn is white.
Answer : We know that, Probability of occurrence of an event By permutation and combination, total no.of ways to pick r objects from given n objects is nCr Now, total no.of ways to pick a ball from...
In a single throw of two dice, find P (a total of 9 or 11)
Answer : We know that, Probability of occurrence of an event (2, 1), (2, 2), (2, 3), (2, 4), (2, 5), (2, 6),Total outcomes are (1, 1), (1, 2), (1, 3), (1, 4), (1, 5), (1, 6), (3, 1), (3, 2), (3, 3),...
In a single throw of two dice, find P (a total greater than 8)
Answer : We know that, Probability of occurrence of an event Total outcomes are (1, 1), (1, 2), (1, 3), (1, 4), (1, 5), (1, 6), (2, 1), (2, 2), (2, 3), (2, 4), (2, 5), (2, 6), (3, 1), (3, 2), (3,...
In a single throw of two dice, find P (a total of 10)
Answer : We know that, Probability of occurrence of an event Total outcomes are (1, 1), (1, 2), (1, 3), (1, 4), (1, 5), (1, 6), (2, 1), (2, 2), (2, 3), (2, 4), (2, 5), (2, 6), (3, 1), (3, 2), (3,...
In a single throw of two dice, find P (a number greater than 3 on each die)
Answer : We know that, Probability of occurrence of an event (2, 1), (2, 2), (2, 3), (2, 4), (2, 5), (2, 6),Total outcomes are (1, 1), (1, 2), (1, 3), (1, 4), (1, 5), (1, 6), (3, 1), (3, 2), (3, 3),...
In a single throw of two dice, find P (an odd number on the first die and a 6 on the second)
Answer : We know that, Probability of occurrence of an event (2, 1), (2, 2), (2, 3), (2, 4), (2, 5), (2, 6),Total outcomes are (1, 1), (1, 2), (1, 3), (1, 4), (1, 5), (1, 6), (3, 1), (3, 2), (3, 3),...
In a single throw of two dice, find P (an odd number on the first die and a 6 on the second)
Answer : We know that, Probability of occurrence of an event (2, 1), (2, 2), (2, 3), (2, 4), (2, 5), (2, 6),Total outcomes are (1, 1), (1, 2), (1, 3), (1, 4), (1, 5), (1, 6), (3, 1), (3, 2), (3, 3),...
In a single throw of two dice, find the probability of (ii)getting a doublet of odd numbers
(iii)getting the sum as a prime number
(iii)getting the sum as a prime number
Answer : (i) We know that, Probability of occurrence of an event (2, 1), (2, 2), (2, 3), (2, 4), (2, 5), (2, 6),Outcomes are (1, 1), (1, 2), (1, 3), (1, 4), (1, 5), (1, 6), (3, 1), (3, 2), (3, 3),...
A die is thrown. Find the probability of getting a number between 3 and 6
Answer : We know that, Probability of occurrence of an event As 4, 5 are two numbers between 3 and, so the desired outcomes are 3, 6, and total outcomes are 1, 2, 3, 4, 5, 6 3/6 Therefore, total...
A die is thrown. Find the probability of getting a multiple of 3
Answer : We know that, Probability of occurrence of an event 2/6As 3, 6 are multiples up to 6, so the desired outcomes are 3, 6, and total outcomes are 1, 2, 3, 4, 5, 6 Therefore, total no.of...
A die is thrown. Find the probability of getting a prime number
Answer : We know that, Probability of occurrence of an event outcomes are 1, 2, 3, 4, 5, 6As 2, 3, 5 are prime numbers up to 6, so the desired outcomes are 2, 3, 5, and total 1/2 Conclusion:...
A die is thrown. Find the probability of getting an odd number
Answer : We know that, Probability of occurrence of an event outcomes are 1, 2, 3, 4, 5, 6As 1, 3, 5 are odd numbers up to 6, so the desired outcomes are 1, 3, 5, and total 2/3 Therefore, total...
A die is thrown. Find the probability of getting a 2 or a 3
Answer : We know that, Probability of occurrence of an event 2/3Total outcomes are 1, 2, 3, 4, 5, 6, and the desired outcomes are 2, 3 Therefore, total no.of outcomes are 6, and total no.of desired...
A die is thrown. Find the probability of getting a 5
Answer : We know that, Probability of occurrence of an event Therefore, total no.of outcomes are 6, and total no.of desired outcomes are 1Total outcomes are 1, 2, 3, 4, 5, 6, and the desired outcome...
A coin is tossed once. Find the probability of getting a tail.
Answer : We know that Probability of occurrence of an event Hence the total no.of outcomes are 2 (i.e. heads and tails)Total outcomes of the coin are tails and heads And the desired output is tail....