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Find the sum of first 22 terms of an AP in which d = 7 and 22nd term is 149?

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Find the sum of first 22 terms of an AP in which d = 7 and 22nd term is 149?
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Solution: a22  = 149 = a + 7 x 21

➪ 149 -147 = 2 =a

Now, S22  = 22/2(2+149) =11 x151 =1661

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