## ! Factorial

One-argument form See also two-argument form Binomial

When applied to a positive whole number, ! gives the product of the whole numbers from 1 to that number, inclusive.

                 ! 3                     (Equivalent of 1×2×3)
           6

If the argument is non-integer and positive, ! gives the mathematical 'gamma function' of the argument + 1.

                 ! 2.5
           3.32335097

Topic: APLX Help : Help on APL language : APL Primitives : ! Factorial

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