Evaluate
(i) $8!$ ii) $4! - 3!$

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Solution

i) $8! = 1 \times 2 \times 3 \times 4 \times 5 \times 6 \times 7 \times 8 = 40320$
ii) $4! = 1 \times 2 \times 3 \times 4 = 24$
$3! = 1 \times 2 \times 3 = 6$
$∴ 4! - 3! = 24 - 6 = 18$

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