What is 123456789 ? - Math riddle

21.Math Riddles

If
123=0
4235=0
656=2
5390=2
8890=6
1001=2
19235=1
What is 123456789?

                123=0
4235=0
656=2
5390=2
8890=6
1001=2
19235=1
What is 123456789?

A.1
B.2
C.4
D.5

Explanation :  

4
You need to count the number of closed circles.
In 123456789,
   6 has 1 closed cirle
   8 has 2 closed circle
   9 has 1 closed circle
So, here are total 4 closed circles.