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Question

If nCr1 = 36,nCr = 84 and nCr+1 = 126, then the value of r is


A

1

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B

2

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C

3

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D

4

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Solution

The correct option is C

3


Here nCr1nCr = 3684 and nCrnCr+1 = 84126

3n10r = -3 and 4n10r = 6

On solving, we get n = 9, r = 3


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