7 is the highest common factor of 21, 77 and 91.
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The HCF of 21, 84 and 91 is.... 1 ! The number 91 is a prime number.
The GCF is 7.
To find the Highest Common Factor (HCF) of 35, 77, and 91, you need to factorize each number. The factors of 35 are 1, 5, 7, 35. The factors of 77 are 1, 7, 11, 77. The factors of 91 are 1, 7, 13, 91. The common factor among these three numbers is 7, so the HCF of 35, 77, and 91 is 7.
The GCF is 7.