12 is to 6 as 8 is to:
Great, you answered "4".
See here what other people have answered:
- 4
- -2
- 6
- 1
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Interesting fact:
Over 24-years-old? I’m afraid you’re over the hill! Our brains start to slow down once we reach this age although different skills may peak at different ages. This is why most of a talented mathematician’s innovative work will happen in the beginning of their career.