2) Digits
0 3 6 7 8 9
Which digit does not belong in this series? solution

3) Numbers
3 4 7 13 20 33 53 86 139
Which number does not belong in this series? solution

4) Ells

Which L does not belong in this series? (solution)

5) Series
Which of the 4 series above is different from the rest? (solution)