1 and 7
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The common factors of 21, 42, and 56 are: 1 and 7
The factors of 21 are: 1, 3, 7, 21. The factors of 56 are: 1, 2, 4, 7, 8, 14, 28, 56.
They are 2 and 7.
The common factors of 40 and 56 are: 1, 2, 4, and 8
Let us find the Highest Common Factor (HCF) for 49 and 56: We know that, The factors of 49 are 1, 7, 49 The factors of 56 are 1, 2, 4, 7, 8, 14, 28, 56 So, the highest common factor of 49 and 56 is 7.