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anonymous
 one year ago
What is the sum of the first n terms of this series?
4 + 6 + 8 + 10 + 12 + ⋯
anonymous
 one year ago
What is the sum of the first n terms of this series? 4 + 6 + 8 + 10 + 12 + ⋯

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alekos
 one year ago
Best ResponseYou've already chosen the best response.0its asking for the first n terms so your looking for a sum from 1 to n

SolomonZelman
 one year ago
Best ResponseYou've already chosen the best response.0The sigma notation isn't hard. You are summing from \(i=1\) (from 4) till \(i=n\) (some nth term which we don't know, but don't need for the sigma) Your pattern here is +2 every time, and you start from 4 Hint: (Think of a line that has a slope 2, and goes through the point (1,4) )

SolomonZelman
 one year ago
Best ResponseYou've already chosen the best response.0(I don't want to give it away, but do want to help.... apologize if it is not enough.

zzr0ck3r
 one year ago
Best ResponseYou've already chosen the best response.0\(\sum_{k=1}^n(2k+2)=2\sum_{k=1}^nk+\sum_{k=1}^n2=2\dfrac{n(n+1)}{2}+2n=n^2+3n\) Let me know if you have any questions.
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