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1. 1 + 2 + 3 + ….. + 19 = কত?

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

Answer: Option D

Explanation:

আমরা জানি, সমষ্টি = ১ম পদ+ শেষ পদ২×পদ সংখ্যা =1+192×19=202×19=10×19=190

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