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If Deltak=|(1,n,n), (2k, n^2+n+1, n^2+n)...

If `Delta_k=|(1,n,n), (2k, n^2+n+1, n^2+n), (2k-1, n^2, n^2+n+1)| and sum_(k=1)^n Delta_k = 56,` then `n` is equal to (i)`4` (ii)`6` (iii)`8` (iv)none

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