Help with Walsh VR, Paper 6, Question 36

[SingleDad]

Can anyone help with the following please? It's a question where we have to find the next in the series.

2 4 6 12 14 [ ]

The answer is 28.

I can see 2 doubled is 4, 6 doubled is 12, and 14 doubled is 28. That's as far as I seem to get. But if that's the rule, then where did the 6 and 14 come from?

Any help appreciated.

[Y]

2 4 6 12 14 [ ]

It's x2, +2, x2, +2, x2

I usually write these out with the 'alternative' methods of getting to the next number written above and below.

So, to get from 2 to 4 you either +2, or x2. Write +2 above, x2 below.

To get from 4 to 6, you can only +2. Write it above.

To get from 6 to 12, you +6 (write it above with the adds), or x2 (write it below with the other times), etc.

I'd show it, but I can't do tables.

[SingleDad]

That's great - thanks for your help.