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Given,ω is imaginary cube root of unity,the value of the expression 1(2ω)(2ω2)+2(3ω)(3ω2)+......(n1)(nω)(nω2) is

(A)14n2(n+1)2n(B)14n2(n+1)2+n(C)14n2(n1)2n(D)14n2(n1)2+n

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