The HCF of 18 and 24 is:

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• A 2
• B 3
• C 6
• D 12

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Answer: C. 6

Factors of 18: 1, 2, 3, 6, 9, 18. Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24. The highest common factor is 6. 12 does not divide 18.

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