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The greatest common denominator is infinite.
The prime factors of 28n are 2, 2, 7, and n. The prime factors of 35 are 5 and 7. The common prime factor that is known is 7. If n is 5 or a multiple of 5, the common prime factors are 5 and 7. There are two possibilities: - If n is not 5 or a multiple of 5, the greatest common factor is 7. - If n is 5 or a multiple of 5, the greatest common factor is 5 x 7 = 35.
The factors of 7 are 1, 7 The factors of 25 are 1, 5, 25 → The common factor(s) of 7 and 25 is (are): 1 → greatest common factor is 1.
The greatest common factor of 7 and 28 is 7.
The greatest common factor of 21 and 77 is 7.