If ω is a complex cube root of unity, then for any n>1, \sum^{n-1}_{r=1}r(r+1-\omega)(r+1-\omega^2)=

Correct Answer is : n(n+1)4(n2+3n+4)

AP EAMCET Engineering 26 Apr 2017 Shift 1 Paper

Section: Mathematics

Question : 9 of 160

Marks: +1, -0

If ω is a complex cube root of unity, then for any n>1,

n−1

r=1

r(r+1−ω)(r+1−ω2)=

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