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ABCD四个人排成一排 Quantity A: the probability that B will precede C Quantity B: 1/2
ABCD四个人排成一排 Quantity A: the probability that B will precede C Quantity B: 1/2
admin
2021-10-18
23
问题
ABCD四个人排成一排
Quantity A: the probability that B will precede C
Quantity B: 1/2
选项
A、Quantity A is greater.
B、Quantity B is greater.
C、The two quantities are equal.
D、The relationship cannot be determined from the information given.
答案
C
解析
四个人排成一排共有P
4
4
=24种排法。B紧挨在C的前面可以分成两步做。先选出2个位置排A和D,共P
4
2
=12种排法;剩下两个位置排B和C,由于B在C前面,只有一种可能,两步结合起来,B在C前面共有12种可能,概率为12/24=1/2,选择C。
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