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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  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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