Solution:

When 2 coins are tossed, the possible outcomes are HH. HT, TH, TT.

Number of possible outcomes = 4

(i)Let E be an event of getting 2 tails.

Favourable outcomes = TT

Number of favourable outcomes = 1

P(E) = 1/4

Probability of getting 2 tails is 1/4 .

(ii)Let E be an event of getting one tail.

Favourable outcomes = TH, HT

Number of favourable outcomes = 2

P(E) = 2/4 = 1/2

Probability of getting one tail is 1/2 .