Question

Two unbiased coins are tossed simultaneously. Find the probability of getting:
one tail

Answer 1

If two unbiased coins are tossed simultaneously we obtain any one of the following as an outcome.HH, HT, TH, TT.$\therefore$ Total number of elementary events = 4
One tail is obtained if any one of the following elementary events occurs: TH, HT.
$\therefore$ Favourable number of elementary events = 2.
Hence, required probability = $\frac{2}{4}=\frac{1}{2}$.