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Question -

Evaluate
(i) 8!
(ii) 4! тАУ 3!



Answer -

(i) Consider 8!
We know that 8! = 8 ├Ч 7 ├Ч 6 ├Ч 5 ├Ч 4 ├Ч 3 ├Ч 2 ├Ч 1
= 40320
(ii) Consider 4!-3!
4!-3! = (4 ├Ч 3!) тАУ 3!
Above equation can be written as
= 3! (4-1)
= 3 ├Ч 2 ├Ч 1 ├Ч 3
= 18

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