What is the greatest common factor (GCF) of 84 and 126?
Correct answer: D. 42
84 = 2² × 3 × 7 and 126 = 2 × 3² × 7. The common factors with the lowest powers are 2 × 3 × 7 = 42. Check: 84 ÷ 42 = 2 and 126 ÷ 42 = 3.
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Answer and explanation
The correct answer is D. 42
84 = 2² × 3 × 7 and 126 = 2 × 3² × 7. The common factors with the lowest powers are 2 × 3 × 7 = 42. Check: 84 ÷ 42 = 2 and 126 ÷ 42 = 3.
Topic: Basic Operations and Number Sequence MCQs · Subject: Numerical Ability