Translated Question: n€N* and z1, z2, z3, . . . zn are complex numbers. Demonstrate that inequality (from the picture, with sum symbol) is for any z€C <=> z1+z2+z3+...+zn=0 Need handwritten solutions/n28772. Fie n Є N* şi 21, 22, ..., 2n Є C. Arătați că 71 Σ22-2>|zk|², pentru orice z = C, k=1 k=1 dacă şi numai dacă z₁+z2+...+ 2n = 0.

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