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Q.

In a group of boys, two boys are brothers and in this group, 6 more boys are there. In how many ways, they can sit if the brothers are not to sit along with each other :

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a

2830

b

1410

c

4820

d

none of these

answer is D.

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Detailed Solution

Required number of ways

= Total number of ways in which 8 boys can sit

- Number of ways in which two brothers sit together

=8!7!×2!=7!×6=30240

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