5!
= 5 × 4 × 3 × 2 × 1
= 20 × 3 × 2 × 1
= 60 × 2 × 1
= 120 × 1
= 120
°°
7!
= 7 × 3 × 1
= 21 × 1
= 21
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5!
= 5 × 4 × 3 × 2 × 1
= 20 × 3 × 2 × 1
= 60 × 2 × 1
= 120 × 1
= 120
°°
7!
= 7 × 3 × 1
= 21 × 1
= 21
__________________