Tis known in refined company, that choosing K things out of
N can be done in ways as many as choosing N minus K from N:
I pick K, you the remaining.
This simply states the binomial coefficient identity .
Find though a cooler bijection, where you show a knack
uncanny, of making your choices contain all K of mine.For
pedantry let K be no more than half N.
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If y/x = 1/3 and x + 2y = 10, then x is
11:? 92 92 42 38 42 18 14 14 18 6 4 2 4 6
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