An Extra nCr Formula
I accidentally obtain this formula when I made a change in one question from x + y + z = 8 to x + y + z < 9 where x, y and z are integers. For details read the proof.
Showing posts with label Permutation and Combination. Show all posts
Showing posts with label Permutation and Combination. Show all posts
Saturday, December 26, 2009
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