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The sequence goes (starting from the six): Up 3: 6 + 3 = 9

Then you subtract 1: 9 - 1 = 8

Then you add 3 again: 8 + 3 = 11

then subtract 1 again: 11 - 1 = 10

The sequence is up 3, minus 1.

You subtract 1 from 13 to get the 12,

then you have to add 3 again. 12 + 3 = 15

15 comes next.

Hope I helped!

- Darg

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14y ago

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