ML Aggarwal
Avichal Publication
Arithmetic Progression
Chapter 9
Question no 8
We have been asked that to find the sum of first 22 terms of an AP in which d = 7 and 22nd term is 149.
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a22=149=a+7×21
⇒149−147=2=a
Now,
S22=222(2+149)=11×151=1661