1+2+3+................+n= কত?

প্রশ্নঃ 1+2+3+................+n= কত?

  • ক. n(n+1)2
  • খ. n2(n+1)24
  • গ. n2
  • ঘ. n(n+1)(n+2)6

সঠিক উত্তরঃ

n(n+1)2
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