Mathematics, 14.05.2021 22:30, mccdp55

A series of odd numbers fulfills that the signs change every 3 terms. So the first 12 terms look like 1 + 3 + 5-7-9-11 + 13 + 15 + 17-19-21-23 +…
What is the sum of the first 2021 terms?

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A series of odd numbers fulfills that the signs change every 3 terms. So the first 12 terms look lik...