Asked by Narancia Ghirga

Find the sum of the first 30 terms of the sequence: -1, 1, -1, 1, -1, …
I got -1 is it okay?
Answered by Reiny
no
-1, 1, -1, 1, -1, …
sum = (-1 + 1) + (-1 + 1) + (-1+1) + … for 15 of those
= 0+0+....
= 0
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