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1.

The sum of first 17 terms of the series 5, 13, 17, --- is -

  • A. 529
  • B. 529
  • C. 529
  • D. 529

Answer: Option C

Explanation:

এখানে, প্রথম পদ a = 5

সাধারন অন্তর d = 9 - 5 = 4

পদসংখ্যা n = 17

17 টি পদের সমষ্টি = 17/2 { 2 × 5 + ( 17 - 1) 4 } = 629.


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