Question

Three coins are tossed once. Find the probability of getting
(i) 3 heads

(ii) 2 heads

(iii) at least 2 heads

(iv) at most 2 heads

(v) no head

(vi) 3 tails

(vii) exactly two tails

(viii) no tail

(ix) at most two tails.

Answer 1

When three coins are tossed once, the sample space is given by
S = {HHH, HHT, HTH, THH, HTT, THT, TTH, TTT}
Accordingly, n(S) = 8
It is known that the probability of an event A is given by