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Question

If nCr = nCr1 and nPr = nPr+1, then the value of n is



A

3

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B

4

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C

2

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D

5

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Solution

The correct option is D

3


The conditions provided that n - r = r - 1 r = n+12

So if we put n = 3, then r = 2 satisfies the conditions.


Mathematics

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