how get it?
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hi, I got combination by: n! n_C_k = ---------- k!(n - k)!
8_C_3=56 for ex.:x=abcdefgh can I get 56 combination of x? i.e how get? abc abd abe . . . thanks in advance
回答（2 个）
bym
2011-9-18
combnk('abcdefgh',3)
Andrei Bobrov
2011-9-18
nchoosek(x,3)
1 个评论
Fangjun Jiang
2011-9-18
Remember to assign x as x='abcdefgh'
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2011-9-18
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