Q1: Which of the following numbers will completely divide (3²⁵ + 3²⁶ + 3²⁷ + 3²⁸) ?

ANS:D - 30

(3²⁵ + 3²⁶ + 3²⁷ + 3²⁸) = 3²⁵ x (1 + 3 + 3² + 3³) = 3²⁵ x 40      = 3²⁴ x 3 x 4 x 10      = (3²⁴ x 4 x 30), which is divisible by30.