Question

A coin is tossed, twice, what is the probability that at least one tail occurs?

Answer 1

Here, S = {HH, HT, TH, TT}; n(S) = 4

A = {TH, HT, TT}; n(A) = 3

P(A) = \(\frac{n(A)}{n(S)} = \frac{3}{4}\).