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In a group of boys two boys are brothers...

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

A

`2xx6!`

B

`""^7P_2xx6!`

C

`""^7C_2xx6!`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
B
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OMEGA PUBLICATION-PERMUTATIONS AND COMBINATIONS-Multiple Choice Questions (MCQs)
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  2. Seven women.and seven men are to sit around a circular table, such tha...

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  3. In how many ways can 5 different beads be arranged to form a necklace?

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  4. The value of ""^(15)C(11)+""^(15)C(10) is equal to

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  5. If \ ^(43)C(r-6)=\ ^(43)C(3r+1)\ then the value of r is

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  6. ""^nCr+2^nC(r+1)+""^nC(r+2) is equal to (2 le r le n)

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  7. Every body in a room shakes hand with every body else. The total numbe...

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  8. There are n points in a plane of which p points are collinear. How man...

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  9. There are n points in a plane of which p points are collinear. How man...

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  10. The number of diagonals that can be drawn by joining the vertices of a...

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  11. A polygon has 44 diagonals. The number of its sides is

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  12. The value of ""^8P7 is

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  13. P(n, 6) = 3 P(n, 5), then n is equal to

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  14. If 2 ""^nP3 = ""^(n+1)P3, then n is equal to

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  15. The value of ""^nPr, and ""^nCr will be equal when

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  16. (C(9,7))/(C(9,5))=?

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  17. The numbers of diagonals in an n sided figure is equal to

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  18. If ""^(35)C(n+7)=""^(35)C(4n-2) then all the values of n are given by

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  19. Ashok, Usha, Rani, Sonu are to give speeches in a class. The teacher c...

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  20. How many words can be formed from the letters of the word 'COMMITTEE'?

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