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

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Solution

$∵ n! = n (n - 1) (n - 2) . . . .3 .2 .1$

$(i) 8! = 8 \times 7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1 = 40320$

$(i i) 4! - 3! = 4 \times 3 \times 2 \times 1 - 3 \times 2 \times 1 = 24 - 6 = 18$

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