The common factors of 42 and 77 are: 1 and 7
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To find the Highest Common Factor (HCF) of 42, 77, and 84, you first need to find the prime factors of each number. The prime factors of 42 are 2, 3, and 7. The prime factors of 77 are 7 and 11. The prime factors of 84 are 2, 3, and 7. To find the HCF, you need to identify the common prime factors and multiply them together. In this case, the HCF of 42, 77, and 84 is 7.
There are no common factors of 77 because there cannot be common factors without two or more numbers to compare. Common factors are factors that the numbers being compared have in common. Examples: The common factors of 14 and 77 are 1 and 7. The common factors of 66 and 77 are 1 and 11. The common factors of 77 and 154 are 1, 7, 11, and 77.
Factors of 42: 1, 2, 3, 6, 7, 14, 21, 42Factors of 77: 1, 7, 11, 77Factors of 84: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84GCF (42, 77, 84) = 7
The common factors of 77 and 121 are 1 and 11.