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If .^(43)C(r-6)=.^(43)C(3r+1), the value...

If `.^(43)C_(r-6)=.^(43)C_(3r+1)`, the value of r is

A

6

B

8

C

10

D

12

Text Solution

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The correct Answer is:
D
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Knowledge Check

  • If ""^(15)C_(r+1):""^(15)C_(3r)=3:11 , then value of r is :

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  • If ""^(n+1)C_(r+1):""^(n)C_(r):""^(n-1)C_(r-1)=11:6:3 , then value of n is

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