The difference between each adjacent pair is
2,6,18,54.
Each difference is multiplied by '3'
Hence
2 x 3 = 6
6 x 3 = 18
18 x 3 = 54
So the next difference would be
54 x 3 = 162
So 84 + 162 = 246 is the next term.
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The least common multiple of 12, 30, and 84 is 420.
The GCF of 30 and 84 is 6. The GCF of 126 and 12 is also 6.
LCM(6, 12, 14) = 84
The greatest common factor of the numbers 30, 84 and 126 is 6.
The least common multiple of 7 , 12 = 84