Lluosrifau o 6: 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72, Nid ydynt yn lusorifau o 6: 3, 9, 16, 13, 22, 26, 33, 32, 34, 40, 58, 68,

Pa rifau sy'n luosrifau o 6?

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