HCF, Highest common factor, HCF of 4 and 8, 4, Factor of every number, 1, HCF of 5, 10 and 15, 5, Highest factor of 21, 21, Factor of 10, 5, HFC of 12 and 15, 3, Even prime number, 2, Composite number, 15, HCF of 8 and 24, 8

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