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
4820
b
1410
c
2830
d
None of these
answer is D.
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Detailed Solution
6 boys can sit in 6! ways×B1×B2×B3×B4×B5×B6×Now, two brothers can sit in any of the 7 cross marked (×) placesTherefore, required number of ways =6!×7C2×2! = 30240