The series are as follows:
$6, 18, 21, 60, 66, 198, 201$
I was able to identify one alternate series:
$\mathbf{6}, 18, \mathbf{21}, 60, \mathbf{66}, 198, \mathbf{201}$ as +1*3 that eliminates 4 numbers, what about the other 3?
2026-03-25 12:55:07.1774443307
What's the wrong number in the series?
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Its 60 for sure the series follow a pattern of $×3+3$ instead of $60$ it must have been $63$ for more clarification :$ 6×3=18; 18+3=21; 21×3=63; 63+3=66; 66×3=198$ and so on.