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Question

If n+1C3=2.nC2, then =


A

3

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B

4

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C

5

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D

6

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Solution

The correct option is C

5


n+1C3=2.nC2

(n+1)!3!(n2)!=2×n!2!(n2)!

(n+1)n!3×2!(n2)!=2×n!2!(n2)!

n+1=6

n=5


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