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A game consists of spinning arrow which comes to rest pointing at one of the numbers

   

as shown below. If the outcomes are equally likely, find the probability that the pointer will point at:

   

a prime number

   

a number greater than

   

Solution:

   

Favorable outcomes for a prime number are

   

So, number of favorable outcomes

   

Hence, P(the pointer will be at a prime number)

   

   

Favorable outcomes for a number greater than

   

So, number of favorable outcomes

   

Hence,