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Three unbiased coins are tossed.What is the probability of getting exactly two heads. |
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Answer» When 3 UNBIASED COINS are tossed, the sample space is {HHH, HTH, HHT, THH, THT, TTH, HTT, TTT] = 8
Event of getting two heads = {HTH, HHT, THH} = 3
P(Two Heads) = 3/8
Event of getting At least two heads (two or more than 2 heads) = {HHH, HTH, HHT, THH} = 4
P(At least Two Heads) = 4/8 = 1/2
Event of getting No heads = {TTT} = 1
P(No Heads) = 1/8 |
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