જો ${z_1}, {z_2}, {z_3}, ......, {z_n}$ એ એકમના $n$ માં મૂળ (roots of unity) હોય,તો $k = 1, 2, ....., n-1$ માટે:

  • A
    $|{z_k}| = k|{z_{k + 1}}|$
  • B
    $|{z_{k + 1}}| = k|{z_k}|$
  • C
    $|{z_{k + 1}}| = |{z_k}| + |{z_{k + 1}}|$
  • D
    $|{z_k}| = |{z_{k + 1}}|$

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જો $z_1, z_2, z_3, z_4$ એ સમીકરણ $z^4 = 1$ ના બીજ હોય,તો $\sum_{i=1}^4 z_i^3$ ની કિંમત શોધો.

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