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प्रश्न
Three coins are tossed together. Find the probability of getting at least one head and one tail.
उत्तर
When three coins are tossed once, the sample space is given by
S = {HHH, HHT, HTH, HTT, THH, THT, TTH, TTT}
i.e. n (S) = 8
Let E3 = event of getting at least one head and one tail
Then E3 = {HHT, HTH, HTT, THH, THT, TTH}
i.e. n(E3) = 6
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