-3 0 3
then 6 9 12 15 18 21 and so on ...
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11, -10, 9
12, 10 and 15 the are alternatively increased by 2 and 3
The factors of the numbers are 12: 1, 2, 3, 4, 6, and 12 15: 1, 3, 5, and 15 30: 1, 2, 3, 5, 6, 10, 15, and 30 The GCF of the three numbers is the largest number that is a factor of all three numbers, which is 3.
Each number is three times the previous number.
12 & 15