20
alternate numbers and double difference
6 / 8 / 12 = +2 / +4 / so +8 next = 12 + 8 = 20
(3 / 4 / 6 / 10 = +1 / +2 / +4 / so same again = 10 + 8 = 18
3 6 4 8 6 12 10 20 18 36 34 68 66
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12
The rule of this pattern is -2 + 6 +4 so the next number would be 16.
24
12
The sequence changes by multiplying with different numbers: from 3 to -6 (* -2), -6 to 12 (* -2), 12 to 4 (* 0.33), and 4 to 20 (* 5). If we continue this pattern, 20 multiplied by 0.5 gives us 10. So, the next number is 10.