If ω is a nonreal cube root of unity then 1+2 ω+3 ω^2/2+3 ω+ω^2+2+3 ω+ω^2/3+ω+2 ω^2 is equal to (...

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If ω is a nonreal cube root of unity then
1+2 ω+3 ω^2/2+3 ω+ω^2+2+3 ω+ω^2/3+ω+2 ω^2 is equal to
(a) -1
(b) 2 ω
(c) 0
(d) -2 ω

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