यदि .^(15) C(r) : .^(n) C(r - 1) = 11 : ...

यदि `.^(15) C_(r) : .^(n) C_(r - 1) = 11 : 5` हो, तो r =

A

4

B

5

C

6

D

7

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यदि .^(15) C(r) : .^(n) C(r - 1) = 11 : 5 हो, तो r =
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