जॉइन Examsbook
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प्र: Find the sum to 200 terms of the series 2 + 5 + 7 + 6 + 12 + 7 + ....

  • 1
    30,400
  • 2
    30,200
  • 3
    34,600
  • 4
    38,400
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उत्तर : 1. "30,400"
व्याख्या :

Answer: A) 30,400 Explanation: we can treat every two consecutive terms as one.So, we will have a total of 100 terms of the nature:(2 + 5) + (7 + 6) + (12 + 7).... => 7, 13, 19,....   We know the sum of n terms  nn+12   Now, a= 7, d=6 and n=100Hence the sum of the given series is S= 100/2 x[2 x 7 + 99 x 6]=> 50[608]=> 30,400.

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