Dk=|(1,n,n),(2k,n^2+n+1,n^2+n),(2k-1,n^2...

`D_k=|(1,n,n),(2k,n^2+n+1,n^2+n),(2k-1,n^2,n^2+n+1)| and sum_(k=1)^nD_k=56` then n equals:

A

4

B

6

C

8

D

None of these

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The correct Answer is:

D

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