問題詳情

303. An experiment consists of tossing three fair coins and is deemed a success if the result is three heads or three tails. The experiment is repeated until a success occurs.

Calculate the probability that it takes exactly three experiments to obtain a success.
(A) 0.047
(B) 0.070
(C) 0.141
(D) 0.188
(E) 0.422

參考答案

答案:C

統計:A:0,B:0,C:0,D:1,E:0

難度:計算中