GWD21-17

meckychen · 发表于 2010-1-7 16:30:53

Q17:

John has 5 friends who want to ride in his new car that can accommodate only 3 passengers at a time. How many different combinations of 3 passengers can be formed from the 5 friends?

A. 3

B. 8

C. 10

D. 15

E. 20

Answer: B

How to calculate? Thanks

meckychen · 发表于 2010-1-7 17:16:28

Ronnie147 · 发表于 2010-1-7 19:11:29

同问，难道不是C53=10吗？

meckychen · 发表于 2010-1-7 21:36:13

yes, you r right. Thank you.

GWD21-17

同问

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