1, 2, 3, 4, 6, 9, 12, 18, 36
1, 2, 3, 6, 9, 18, 27, 54
1, 3, 9, 27, 81
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The common factors of 36 and 81 are: 1, 3, and 9
It is 9
Common factors of 36 and 54 are: 1, 2, 3, 6, 9, and 18.
This is not a geometric series since -18/54 is not the same as -36/12
81