**Question:**

123 = 0

4235 = 0

656 = 2

5390 = 2

8890 = 6

1001 = 2

19235 = 1

What is 123456789 = ?

**Answer:**

The answer is 4. You need to calculate the number of closed circles in all the digits like 6 has only 1 closed circle and 8 has 2 closed circles. Then 123456789 has 4 closed circles. (689)