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Eamcet Mathematics
Algebra Permutations And Combinations

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Q.

In how many ways n books can be arranged in a row so that two specified books are not together

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Correct choice: B

Explanation:

Total number of arrangements of n books =n! .
If two specified books always together then number of ways = (n-1)! × 2
Hence required number of ways = n! - (n-1)!×2
=n(n-1)! - (n-1)× 2= (n-1)!(n-2).
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