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The greatest common factor of 42, 54, and 78 is 6.

54 = 2 x 3^3

42 = 2 x 3 x 7

78 = 2 x 3 x 13

So the highest common factor is 2 x 3 = 6

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Q: What is the greatest common factor of 42 54 and 78?
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