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What is the HCF of 18 and 24?

A$6$
B$3$
C$12$
D$2$
Answer & Solution
Correct answer: A. $6$
18 = 2 × 3². 24 = 2³ × 3. Common primes: 2 and 3. Smallest powers: 2¹ and 3¹. HCF = 2 × 3 = 6.
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