Answer and explanation

Correct answer: D.

  1. Step 1: Factorise: . Step 2. Add one to each exponent and multiply: . **Answer: . Why not the others:** counts only half the divisors; the others misuse the exponents.

Practise more Arithmetic, Algebra, Geometry and Trigonometry.

Free questions with an explanation for every one, and full timed UNI Admission Exam (Peru) mock tests.