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What is the sum of the first 9 terms of an arithmetic progression if the first term is 7 and last term is 55?

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What is the sum of the first 9 terms of an arithmetic progression if the first term is 7 and last term is 55?
1). 219
2). 137
3). 231
4). 279


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Answered by on | Votes 0 |

Sum of first 9 terms can be given as

⇒ sum = 9(7 + 55)/2 = 9 × 31 = 279

∴ the sum of first 9 terms is 279

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