选择题
2013 AMC 8 Problem 8: Consecutive Heads
A fair coin is tossed 3 times. What is the probability of at least two consecutive heads?
2013 AMC 8 第8题 ：连续负责人
一个公平的硬币被扔了3次。至少连续两个头的概率是多少？
A.
1/8
B.
1/4
C.
3/8
D.
1/2
E.
3/4