Entry Exam Category: College Admission Exams
Course: Accuplacer
Exam: Free Accuplacer Arithmetic Practice Test
Practice Question
If 3 < a < 7 < b, which of the following must be greater than 20?
Answer Choices
- A: a²
- B: 2b
- C: ab
- D: b + a
Correct Answer: C
Rationale: For a², a = 4 gives 16 < 20. For 2b, b = 7 gives 14 < 20. For ab, a = 3, b = 7 gives 21 > 20, always true since a > 3, b > 7. For b + a, b = 7, a = 3 gives 10 < 20. Only ab is always > 20.