If Dk=∣∣∣∣∣1nn2kn2+n+1n2+n2k−1n2n2+n+1∣∣∣∣∣ and – InterviewSolution

1.	If Dk=∣∣∣∣∣1nn2kn2+n+1n2+n2k−1n2n2+n+1∣∣∣∣∣ and n∑k=1Dk=56, where n∈N, then n is equal to
Answer» If $D_{k} = ∣ ∣∣∣ ∣ \begin{matrix} 1 & n & n 2 k & n^{2} + n + 1 & n^{2} + n 2 k - 1 & n^{2} & n^{2} + n + 1 \end{matrix} ∣ ∣∣∣ ∣$ and $n \sum k = 1 D_{k} = 56,$ where $n \in N,$ then $n$ is equal to

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