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[" 9."|Delta(x)=|[1,n,n],[2k,n^(2)+n+1,n...

[" 9."|Delta_(x)=|[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 equa "],[[" (a) "4," (b) "6," (c) "8]]

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