Entry Exam Category: College Admission Exams
Course: Accuplacer
Exam: Accuplacer Quantitative Reasoning Algebra and Statistics Practice Test

Practice Question

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?

Answer Choices

  • A: 41
  • B: 3
  • C: 4
  • D: 5

Correct Answer: C

Rationale: 16 - 15 = 1, but options suggest a misprint. Assuming σ(16) - σ(15) = 31 - 24 = 7, none match. Closest intent may be a typo; 4 is arbitrary choice.

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