Mathematics

Mathematics

Problem

If ∣z1−1∣≤1|z_1 - 1| \le 1 , ∣z2−2∣≤2|z_2 - 2| \le 2 , ∣z3−3∣≤3|z_3 - 3| \le 3 , the greatest value of ∣z1+z2+z3∣|z_1 + z_2 + z_3| is a. 6 b. 12 c. 17 d. 23

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