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If ''C(4),''C(5),''C(6) are in AP then v...

If `''C_(4),''C_(5),''C_(6)` are in AP then value of n is

A

14

B

11

C

9

D

5

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The correct Answer is:
A
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SURA PUBLICATION-COMBINATORICS AND MATHEMATICAL INDUCTION -Exercise 4.5
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  9. Number of sides of a polygon having 44 diagonals is

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  10. If 10 lines are drawn in a plane such that no two of them are parallel...

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  11. In a plane are 10 points are there out of which 4 points are coll...

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  12. In .^(2n)C(3) :.^(n)C(3) = 11 : 1 then n is

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  13. .^((n-1)C(r) + ^((n-1)) C((r-1)) is

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  14. The number of ways of choosing 5 cards out of a deck of 52 which ...

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  15. The number of rectangles that a chessboard has

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