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Combinatorial number formula

Source: Internet
Author: User
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Formula:

Recursive formulas
The left side of the C (n,m) =c (n-1,m-1) +c (n-1,m) equation is the selection of M elements from n elements, and the right side of the equation represents another implementation of this procedure: an alternative element in the arbitrary selection n is a special element, and the M elements from N can be divided into two kinds of cases by this particular element. That is, M-selected elements contain special elements and M-selected elements do not contain this particular element.

Combinatorial number formula

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