Best Answer

thirty-six

3 6 12

6 12 24

18 36 72

in each group of three double previous number

Q: What number is next 3 6 12 6 12 24 18?

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The differences between a number and the number two on is alternating between 6 and 3. In this case, the next number will be 24 + 6 = 30.

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12 because they are decreasing by increments of 6

Thirty 42 - 18 = 24 24 / 2 = 12 18 + 12 = 30 42 - 12 = 30

Think it's 30...then 20