Additional Mathematics – Permutations and combinations | e-Consult
Permutations and combinations (1 questions)
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7! = 7 × 6 × 5 × 4 × 3 × 2 × 1
= 42 × 5 × 4 × 3 × 2 × 1
= 210 × 4 × 3 × 2 × 1
= 840 × 3 × 2 × 1
= 2520 × 2 × 1
= 5040 × 1 = 5040