Question

5.
In how many ways n books can be arranged in a row so
that two specified books are not together
(a) n!- (n – 2)!
(b) (n - 1)!(n – 2).
(c) n!-2(n - 1)
(d) (n − 2)n!
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Answer 1

Ans.a,n! - (n-2)! This is the ans