Difficulty: Hard
Average Score: 0%

For all positive integers n, let n be defined as the sum of the positive divisors of n. For example, bullet 9 = 1 + 3 + 9 = 13. Which of the following is equal to 16 - 15?

Report an Issue

Help us improve by flagging this content.

Rate this Practice Test

How helpful was this material?

Chat on WhatsApp