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#30954 Bangla Language & Literature ধারা Level 0

1, 2, 3, 4, ----------------- n পর্যন্ত স্বাভাবিক সংখ্যার যোগফল কত?

  1. A n(2n + 1)/2
  2. B n(n + 1)/2
  3. C n2
  4. D {n(n + 1)/2}2
Answer: B - n(n + 1)/2

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