[求助]天山3-23

qwrersaa

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!

himba

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