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Rajan@2021
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Asked: 2021-03-16T09:13:26+05:30 In:

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

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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.

arithmetic progressionclass 10ml aggarwal
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      a22​=149=a+7×21
      ⇒149−147=2=a
      Now,

       S22​=222​(2+149)=11×151=1661

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