Find the wrong number in the following series: 2160, 360, 72, 18, 16, 3

Explanation

The intended operations are successive division by 6, 5, 4, 3 and 2:

2160÷6=360, 360÷5=72, 72÷4=18, 18÷3=6, 6÷2=3.

Therefore the term should be 6, not 16. Hence 16 is the incorrect number.