Python - Count all combinations of K numbers from 1-N whose sum is equal to N

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How do i count all combinations of k numbers from 1-n whose sum is equal to n? Like for n = 10, k = 3, we have (1, 2, 7), (1, 3, 6), (1, 4, 5), (2, 3, 5)

I've tried using itertools.combination but it grows really fast for big numbers



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