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Find the sum of the following series

15
∑(3n-7)
n=1

I got 9 355 and 255 ∑

2 answers

15
∑(3n-7)
n=1

15
3∑n - ∑7 = 3 * 15*16/2 - 7*15 = 255
n=1
he is correct
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