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arithmetic sum

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4 + 10 + + (6n − 2) 2010-04-21
From Lan:
Find the sum 4 + 10 + + (6n − 2). The answer is 3(n^2) + n. How?
Answered by Penny Nom.
Arithmetic Sums 2006-04-12
From Angel:
(a) In a particular arithmetic sequence, u6 = 344.5 and u20 = 88.3. Find S28. (b) In a particular arithmetic series, S10 = 495 and S15 = 1005. Express S15 in sigma notation.
Answered by Stephen La Rocque.
 
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