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| The greatest common factor (gcf) of ints a and b is the largest positive int that divides both a and b without leaving a remainder. For example, the gcf of 12 and 20 is 4. The gcf of 16 and 25 is 1. Given ints a and b (assume positive values for both), return the gcf of the numbers. gcf(12, 20) → 4 gcf(1, 100) → 1 gcf(100, 200) → 100 ...Save, Compile, Run (ctrl-enter) | 
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Difficulty: 200
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