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What is the HCF of 18 and 24?

1. 4
2. 6
3. 12
4. 8

Correct answer: 6

Solution

The factors of 18 are 1, 2, 3, 6, 9, 18 and the factors of 24 are 1, 2, 3, 4, 6, 8, 12, 24. The greatest common factor is 6.

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