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OpenStudy (anonymous):
vWhat is the sum of the first n terms of this series? 4 + 6 + 8 + 10 + 12 + ...?
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OpenStudy (anonymous):
it is an A.P Here a=4,d=6-4=2 \[Sn=\frac{ n }{2 }\left\{ 2a+\left( n-1 \right)d \right\}\] calculate
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