[計量] 請教CAT test8一題
No.22
How many possible committeess can be formed from a
group of seven people if each committee can have any
number of members from one to seven?
(A)7
(B)49
(C)5040
(D)127
(E)98
答案是(D)
大家可以教我一下怎麼算嗎
除了算式之外還有這樣算的原因~
我實在對排列組合很恐懼啊~~~
謝謝大家^^
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