Lluosrifau o 6 , 6, 12, 18, 24, 30, 36, 48, 54, 60, 66, 72, Lluosrifau o 7 , 7, 14, 21, 28, 35, 49, 56, 63, 70, 77, Lluosrifau o 6 a 7, 42, 84.

Pa rifau sy'n luosrifau o 6, yn luosrifau o 7 neu'n luosrifau o 6 a 7?

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