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1. 1+2+3+4+------+19= কত?

  • A. 180
  • B. 180
  • C. 180
  • D. 180

Answer: Option D

Explanation:

এখানে, মোট পদ n = 19

∴ সমষ্টি S = n(n + 1)/2

= 19(19 + 1)/2

= (19×20)/2

= 190

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