### Brain Teasers

# Erratic Equations

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

Fill in the 3 question marks.

1-3, 3/3, 2*2, 6+?, 13-?, 13*1, 3+?

1-3, 3/3, 2*2, 6+?, 13-?, 13*1, 3+?

### Hint

Work out the answers to the filled in equations.### Answer

They are (in order): 1, 3, 13.The equations, when solved, make a second series: -2, 1, 4, 7, 10, 13, 16.

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