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![[Post New]](/templates/default/images/icon_minipost_new.gif) 2 Jun 2007 19:08:23 IST
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first find d nth term by subtracting d same sum of d series .
ie, 3.7.11.15+7.11.15.19+......
- 3.7.11.15+7.11.15.19+.....
nd then use d summation method. hope its clear.
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