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Combination

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  • nCr , nCn =1, nC0 = 1, nCr = nCn–r, nCx = nCy, then x + y = n or x = y, n+1Cr = nCr-1 + nCr
  • When all things are different
  • When all things are not different.
  • Mixed problems on permutation and combinations.
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