Question

Two unbiased coins are tossed simultaneously. Find the probability of getting:
no head.

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
No head is obtained if the elementary events TT occurs.
$\therefore$ Favourable number of elementary events = 1.
Hence, required probability = $\frac{1}{4}$