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Railways PYQCBT 1 2016

RRB NTPC · Question 51

What is the highest common factor of 360 and 450? A. 90 B. 45 C. 10 D. 9

  1. B

  2. D

  3. A

  4. C

Show answer & explanation

Answer: (C) A

Explanation

360 = 2³ × 3² × 5 and 450 = 2 × 3² × 5². The HCF takes the lowest power of each common prime: 2 × 3² × 5 = 90.