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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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