how get it?

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huda nawaf
huda nawaf 2011-9-18
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

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回答（2 个）

bym
bym 2011-9-18
combnk('abcdefgh',3)
  2 个评论
huda nawaf
huda nawaf 2011-9-18
thank you very much
bym
bym 2011-9-18
Andrei's answer works the same; please accept one

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Andrei Bobrov
Andrei Bobrov 2011-9-18
nchoosek(x,3)
  1 个评论
Fangjun Jiang
Fangjun Jiang 2011-9-18
Remember to assign x as x='abcdefgh'

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