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Algebra: Sequences of numbers, series and how to sum them
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Question 296839
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richwmiller, jrfrun
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Answer by
richwmiller(17219)
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Answer by
jrfrun(3)
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The sum of the first 400 even numbers = 2*(sum of the first 200 numbers)
ie 2+4+6+ ....+ 400 = 2(1+2+3+4+...+200) = 2*200*201/2=200*201=40200