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Line 524: <lang J>C=: ! P=: (<%&!&x:~ * ~~(*/@}. 1+i.)~~<:)"0</lang> C is a primitive, but we will give it a name for this task~~. P could be defined using %&!~ but that approach would overflow for large arguments even when the result would have been representable~~. Example use:

Combinations and permutations: Difference between revisions

Combinations and permutations (view source)