1 + 31 + 32 + .... + 35 এর সমষ্টি কত?

1 + 3¹ + 3² + .... + 3⁵ এর সমষ্টি কত?

A 182

B 1456

C 728

D 364

Correct Answer: Option D

দেওয়া আছে,
a = 1
r = 3/1 = 3
n = 6

S = a × {(rⁿ - 1)/(r - 1)}
= 1 × {(3⁶ - 1)/(3 - 1)}
= 364