GWD2-14

kenisjacque

C_(m,n) = m! / [(m-n)! n!] for nonnegative integers m and n, m ³ n.  If C_(5,3) = C_(5,x) and x ¹ 3, what is the value of x?

 

 

A.   0

B.   1

C.   2

D.  4

E.   5

the answer is e, why? Mine is c

johnsonwxjs

就是C， 前面都不需要看，本来就是组合里的公式！ 或者你按照C_(m,n) = m! / [(m-n)! n!]  代进去算一下

答案E C（5，5）=1

kenisjacque

谢谢哦。。。那个答案居然是E。。。想了半天..