题目:
If a certain coin is flipped, the probability that the coin will
land heads up is 1/2. If the coin is flipped 5 times, what is
the probability that it will land heads up on the first 3 flips
and not on the last 2 flips?
选项:
A、3/5
B、1/2
C、1/5
D、1/8
E、1/32
答案:
E