55
If a fair coin is tossed twice, find the probability of getting 'atmost one head'.
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Sol. Total outcomes are HH, HT, TH, TT
Favourable outcomes are HT, TH, TT
P (at most one head) = $\frac{3}{4}$
Favourable outcomes are HT, TH, TT
P (at most one head) = $\frac{3}{4}$