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The greatest common factor (GCF) of two numbers is the largest positive integer that divides both numbers without leaving a remainder. To find the GCF of 19 and 78, you can list the factors of each number: 19 (1, 19) and 78 (1, 2, 3, 6, 13, 26, 39, 78). The only common factor between 19 and 78 is 1, making the GCF of 19 and 78 equal to 1.
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