1+3+5+7+...........ধারাটির n সংখ্যক পদের সমষ্টি কত?

A n(n+1)(2n+1)/2

B {n(n+1)/2}²

C n(n+1)/2

D n²

Correct Answer: Option D

sum of 2 numbers = 1+ 3 = 4 = 2²

sum of 3 numbers =1+ 3 + 5= 9=3³

sum of 4 numbers = 1+ 3 + 5 + 7 = 16 = 4⁴

sum of 5 numbers = 5⁵ = 25

sum of n numbers =n²