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Question

Two unbiased coins are tossed simultaneously. Find the probability of getting:
at least one head

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Solution

If two unbiased coins are tossed simultaneously we obtain any one of the following as an outcome.HH, HT, TH, TT. Total number of elementary events = 4
At least one head is obtained if any one of the following elementary events happens:
HH, HT, TH.
Favourable of elementary events = 3.
Hence, required probability = 34.

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