HCF of 2 and 4, 1, 2, 4, HCF of 18 and 12, 6, 8, 2, HCF of 15 and 20, 3, 5, 20, HCF of 5 and 7, 7, 5, 1, HCF of 16 and 20, 4, 2, 3, HCF of 7 and 14, 14, 5, 7, HCF of 12 and 16, 4, 6, 3

HIGHEST COMMON FACTOR class 7

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