" If "D_(4)=|[1,n],[2k,n^(2)+n+1],[2k-1,n^(2)]quad n^(2)+n sqrt(2n)d sum D_(n)=56," then "n" equals "

If D_k=|[1, n, n];[ 2k, n^2+n+1, n^2+n];[ 2k-1, n^2, n^2+n+1]|a n dsum_(k=1)^n D_k=56. then n equals (a) 4 (b) 6 (c) 8 (d) none of these

If D_k=|[1,n,n],[2k,n^2+n+2,n^2+n],[2k-1,n^2,n^2+n+2]| and sum_(k=1)^n D_k=48 ,then n equals (a)4 (b) 6 (c) 8 (d) none of these

If D_k=|[1,n,n],[2k,n^2+n+2,n^2+n],[2k-1,n^2,n^2+n+2]| and sum_(k=1)^n D_k=48 ,then n equals (a) 4 (b) 6 (c) 8 (d) none of these

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:

If 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)^n D_k=56. then n equals

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 equals a)4 b)6 c)8 d)None of these

If 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)^n D_k=56. then n equals 4 b. 6 c. 8 d. none of these

if D_(k) = |{:( 1,,n,,n),(2k,,n^(2)+n+1 ,,n^(2)+n),(2k-1,,n^(2),,n^(2)+n+1):}|" and " overset(n)underset(k=1)(Sigma) D_(k)=56 then n equals