39. Find the sum of 3nC0-8nC1+13*nC3+---------------upto [n+1] terms.

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39. Find the sum of 3*nC0-8*nC1+13*nC3+---------------upto [n+1] terms.

39. Find the sum of 3nC0-8nC1+13*nC3+---------------upto [n+1] terms.