[問題]GWD gmat 14

[blacklilu]

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

A. 0
B. 1
C. 2
D. 4
E. 5

Ans : C

呼~~哪位大大可以幫我解一下.. 偶又卡住了

[marco]

C(5,3)=5!/(3!2!)=C(5,2)=5!/(2!3!)
所以答案是2

[blacklilu]

(d25) 告訴你.... 偶去跳海好了...
剛剛把 N 不小心寫成 2 ! ... :-$ 難怪怎麼算都帶不出
偶切腹好了 ....