Function number_encoding::combination
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Returns the number of k
-combinations of a set of n
elements.
See wikipedia for more information.
Examples
assert_eq!(combination(4, 0), 1);
assert_eq!(combination(4, 1), 4);
assert_eq!(combination(4, 2), 6);
assert_eq!(combination(4, 3), 4);
assert_eq!(combination(4, 4), 1);
assert_eq!(combination(4, 5), 0);