1.

Find the sum of first n terms of the series 3+7+13+21+31+.... Or If a b and c are in GP and x,y are the arithmetic means of a,b and b,c respectively. prove that ax+cy=2 and 1x+1y=2b.

Answer»

Find the sum of first n terms of the series 3+7+13+21+31+....

Or

If a b and c are in GP and x,y are the arithmetic means of a,b and b,c respectively. prove that ax+cy=2 and 1x+1y=2b.



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