Find the wrong number in the following number series.

6400, 400, 50, 12.5, 6.25, 3, 12.5

Correct option is D

Wrong number = 3
Pattern of series –
6400 ÷16=400
400 ÷8=50
50 ÷4=12.5
12.5 ÷2=6.25
6.25 ÷ 1 = 6.25
6.25 ÷0.5=12.5