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1 3 +3.2 2 +3 3 +3.4 2 +5 3 +2.6 2 .............................................................................................................................to n terms
there are two series here(2r-1)3and one more is 3(2r)2now do their sigma and apply formula for thatas sigma n =n(n+1)/2and sigma n^2=n(n+1)(2n+1)/6
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