Zeer bijzondere faculteiten

Ter herinnering: 7! = 7 faculteit = 1 × 2 × 3 × 4 × 5 × 6 × 7.

10! ÷ 7! = 8 × 9 × 10 = 720
6! = 720, dus
10! ÷ 7! = 6!   of   6! × 7! = 10!

6! ÷ 3! = 4 × 5 × 6 = 120
5! = 120, dus
6! ÷ 3! = 5!   of   3! × 5! = 6!

7! ÷ 4! = 5 × 6 × 7 = 210
15! ÷ 13! = 14 × 15 = 210, dus
7! ÷ 4! = 15! ÷ 13!   of   4! × 15! = 7! × 13!

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