Greatest common factor = 1
3 : 1, 3
4. : 1, 2, 4
6. : 1, 2, 3, 6
12. : 1, 2, 3, 4, 6, 12
............................. ..........
Least common multiple = 12
3 : 3, 6, 9, 12
4. : 4, 8, 12
6. : 6, 12
12 : 12
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