desmath ~master (2021-12-18T03:28:57.6940602)

combinationCount

des math combin count

equals to fact(n) / ( fact(k) * fact( n-k ) )

pure nothrow
long
combinationCount
(
long n
,
long k
)
out (res) { assert (res >= 0); }

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des math combin count functions

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