1 + 2 + 3 + 4 +...........+ 22 = কত?

1 + 2 + 3 + 4 +...........+ 22 = কত?

A 253

B 254

C 256

D 258

Solution

Correct Answer: Option A

n সমষ্টি = [{n(n+1)}/2]

= 22 × (22+1)/2

= 11 × 23 = 253