Let Delta(a)=|{:((a-1),n,6),((a-1)^(2), ...

Let `Delta_(a)=|{:((a-1),n,6),((a-1)^(2), 2n^(2),4n-2),((a-1)^(3),3n^(3),3n^(2)-3n):}|` the value of `sum_(a=1)^(n)Delta_(a)` is

A

0

B

`((n-1)n)/(2)`

C

`((n-1)n^(2))/(2)`

D

`((n-1)n(2n-1))/(3)`

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