1.

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). 2192). 1373). 2314). 279

Answer»

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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