+২+৩+ ----- ৫০=?

A ৩৫৭২৫

B ৪২৯২৫

C ৪৫৫০০

D ৪৭২২৫

Solution

Correct Answer: Option B

  n(n+১)(২n+১)/৬ = ৫০×৫১×১০১/৬ = ৪২৯২৫  

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