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What is the value of high school math problem S = 123i 24i 3 ... 100I 99 (I is an imaginary unit)?
In a variation with a period of 4,

1+2i+3i？ +4i？

= 1+2i-3-4i

=-2-2i

Then the sum of 100 can be divided into 25 groups, and the sum of each group is -2-2i.

Original formula = 25 (-2-2i) =-50-50i.

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