Question

The sum of all odd positive integral divisors of 1800 is

• A. 13 x31
• B. 14x13
• C. 14x31
• D. 14

Answer 1

Answer: (A)

13 x31

Answer 2

1800 = 2³ x 3² x 5²

∴ Sum of all odd divisors

= (3⁰ + 3¹ + 3²) (5⁰ + 5¹ + 5²)

= 13 x 31