3's multiplication

STUDY
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3 * 1
3
3 * 2
6
3 * 3
9
3 * 4
12
3 * 5
15
3 * 6
18
3 * 7
21
3 * 8
24
3 * 9
27
3 * 10
30
3 * 11
33
3 * 12
36