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标题: [求助]天山3-23 [打印本页]

作者: qwrersaa 时间: 2005-3-16 07:14 标题: [求助]天山3-23

Q23: When tossed, a certain coin has equal probability of landing on either side. If the coin is tossed 3 times, what is the probability that it will land on the same side each time? 这题答案是1/4,

请问大侠, 怎么算出来的? 盼赐教!

作者: himba 时间: 2005-3-16 07:17

每次都是正面：1/2*1/2*1/2 =1/8

每次都是反面：与上同

因此 1/8 *2 =1/4

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