Q14:
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
A. 0
B. 1
C. 2
D. 4
E. 5
Answer: c
不明白啥意思啊?没找到讨论贴
C(m,n)=m!/[(m-n)!n!]
C(5,3)=5!/[(5-3)!3!]=5!/[(2)!3!]
=C(5,2)=5!/[(5-2)!2!]=5!/[(3)!2!]
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