Verified Answer :

oberjarlpotter

9 groups of 2 (9 x 2)
2 groups of 9 (2x9)
3 groups of 6
6 groups of 3
1 group of 18
and 18 groups of 1

SilverSWolfe

1) One group of 18
2) two groups of 9
3) three groups of 6
4) six groups of 3
5) nine groups of 2
6) eighteen groups of 1

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