问个蠢问题, 投COIN

vincentwh

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?

 

A.    

B.    

C.    

D.    

E.     

这道题目的答案应该是几呢?  我算出来1/8, 可给的答案是1/4, NN能否解释一下?

wyc

楼主只算了都正面或反面的情况

两种加起来就是1/4

vincentwh

3X！