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July 28, 2015

Homework Help: Math(arithmetic & Geometric Series)

Posted by Estrick Abel on Saturday, March 23, 2013 at 7:38pm.

1)The sum of 6 terms of an arithmetic series is 45, the sum of 12 terms is -8. Find the first term and the common difference?

2)If in a geometric sequence the sum of the second and the third is 20 and the sum of the fourth and fifth is 320, find the common ratio and the first term. Assume that the common ratio is possitive.

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