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

`.^((n-1)C_(r) + ^((n-1)) C_((r-1)) ` is

A

`.^(n+1)C_(r)`

B

`.^((n-1))C_(r)`

C

`.^(n)C_(r)`

D

`.^(n)C_(r-1)`

Text Solution

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The correct Answer is:
C
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SURA PUBLICATION-COMBINATORICS AND MATHEMATICAL INDUCTION -Exercise 4.5
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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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  16. The number of 10 digit number that can be written by using the digit...

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  17. If P stands for P(r) then the sum of the series 1 + P(1) + 2P(2)...

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  18. The product of first n odd natural numbers equals:

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  19. If ''C(4),''C(5),''C(6) are in AP then value of n is

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