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
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
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