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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