### Brain Teasers

# 4, 12, 84, ...

Series
Series teasers are where you try to complete the sequence of a series of letters, numbers or objects.

What is the next number in this series?

4, 12, 84, 3612....

4, 12, 84, 3612....

### Hint

Use squared equations.### Answer

6526884. To get from 4 to 12, you use the following formula. 12 = (4 squared)/2 + 4.Continue on with (X^2)/2 + X.

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