ChaseDream

标题: YYGWD9-23 [打印本页]

作者: amyding85 时间: 2006-9-4 18:02
标题: YYGWD9-23

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?

答案四分之一，倍努力公式是什么来着？哪位记得？

作者: stephanieslm 时间: 2006-9-4 22:37
(1/2×1/2×1/2)×2，我的理解是on the same sides for three times 有两种情况，都是正面或都是反面，而都是正面的概率和都是反面的概率都是1/8

欢迎光临 ChaseDream (https://forum.chasedream.com/)