# Algebra 2

Evaluate the series the lower limit of summation notation is 'n = 3"

8
E 5n
n=3

what do you do first?

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2. 👎
3. 👁
1. one way: just list the terms:

15,20,25,30,35,40

now add 'em up.

Or, recognize this an an A.P. with
a=15
d=5
and you want to sum the first 6 terms:
S6 = 6/2 (2*15+5*5) = 165

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2. 👎

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