Three fair coins are tossed at the same time. What is the pr

题目
单选题
Three fair coins are tossed at the same time. What is the probability that all three coins will come up heads or all will come up tails?
A

1/8

B

1/6

C

1/4

D

1/3

E

3/8

参考答案和解析
正确答案: E
解析:
If three fair coins are tossed at the same time, the probability that all three will come up heads is (1/2)×(1/2)×(1/2) or 1/8. probability that all three coins will come up tails is also (1/2) × (1/2) × (1/2) or 1/8. Hence, the probability that all three coins will come up heads or all will come up tails is (1/8)+(1/8) or 1/4.
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