Question

4. Two unbiased coins are tossed. Calculate the probability that

(a) Two heads are obtained.
(b) One head and one tail is obtained.

Answer 1

2 coins have four possible outcomes: {HH, HT, TH, TT}

(a) P(2 heads) = 1/4

(b) P(1 head and 1 tail) = 2/4 = 1/2