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If z1,z2,z3,z4 are imaginary 5th roots o...

If `z_1,z_2,z_3,z_4` are imaginary 5th roots of unity, then the value of `sum_(r=1)^(16)(z1r+z2r+z3r+z4r),i s` 0 (b) `-1` (c) 20 (d) 19

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