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Question

If (n+1)!=12(n1)!, then the value of n is

A
2
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B
3
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C
4
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D
5
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Solution

The correct option is B 3
(n+1)!=12(n1)!(n+1)×n×(n1)!=12×(n1)!n(n+1)=12n2+n12=0(n+4)(n3)=0n=3 (n can't be negative)

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