Question

Three unbiased coins are tossed together. Find the probability of getting:
one head

Answer 1

Elementary events associated to random experiment of tossing three coins are HHH, HHT, HTH, THH, HTT, THT, TTH, TTT
$\therefore$ total number of elementary events = 8.
The events of getting one head, when three coins are tossed together, occurs if one of the elementary events HTT, THT, TTH happens.
$\therefore$ Favourable number of elementary events = 3
Hence, required probability = $\frac{3}{8}$