double factorial in Dutch

double factorial in Dutch is dubbelfaculteit.

double factorial in Dutch

dubbelfaculteit

noun

(mathematics, combinatorics) For an odd integer, the result of multiplying all the odd integers from 1 to the given number; or for an even integer, the result of multiplying all the even integers from 2 to the given number; symbolised by a double exclamation mark (!!). For example, 9!! = 1 × 3 × 5 × 7 × 9 = 945.

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