1.

Find the sum on n term of the A.P 5,2,-1,-4,-7, ......

Answer»

Sn \(= \frac{n}{2}[2a + (n-1)d]\)

\(= \frac{n}{2} [10 + (n-1)-3]\)

\(\frac{n}{2} [13 - 3n]\)



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