- #1
songoku
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Homework Statement
Prove that:
[tex]\sum_{n=1}^{14} 10n = \sum_{n=1}^{7} (20n+70)[/tex]
Homework Equations
properties of sigma notation
The Attempt at a Solution
I know several properties of sigma notation but none that I know can be used to prove this. I don't know how to change 10 n to 20 n
Thanks