What is the HCF (Highest Common Factor) of 36, 54, and 90?

A6

B9

C18

D27

Explanation

Prime factorizations: 36 = 2^2 × 3^2, 54 = 2 × 3^3, 90 = 2 × 3^2 × 5. The common prime factors with lowest powers are 2^1 × 3^2 = 2 × 9 = 18.

Exam Relevance

Topic: Number System
Subtopic: HCF and LCM

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