Probability
2010-06-08 1:36 am
A coin is tossed until a head appears or until it has been tossed 3 times. Find the probability that the coin is tossed 3 times and the first toss is not a head.
回答 (1)
2010-06-08 1:52 am
✔ 最佳答案
The possible cases :P(T T T) + P(T T H)
= (1/2)^3 + (1/2)^3
= 1/4
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