1) 1; 2
2) 1, 2, 3, 4; 6; 12
3) 1; 2; 3; 9; 18
4) 1
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Answers & Comments
1) 1; 2
2) 1, 2, 3, 4; 6; 12
3) 1; 2; 3; 9; 18
4) 1