## Mysterious Math

This problem can be solved by preschool children in five to ten minutes, by programmers in an hour and by people with higher education…well, check it yourself.

8809 = 6

7111 = 0

2172 = 0

6666 = 4

1111 = 0

3213 = 0

7662 = 2

9313 = 1

0000 = 4

2222 = 0

3333 = 0

5555 = 0

8193 = 3

8096 = 5

1012 = 1

7777 = 0

9999 = 4

7756 = 1

6855 = 3

9881 = 5

5531 = 0

2581 = ?

What is the missing number and why?

Two. The number is how many closed circles there are in the 4 digits. 0, 6 and 9 each have one, 8 has 2.

Posted in Brain Teasers

2 Comments on "Mysterious Math"Me says

December 18, 2016 @ 11:18

2

closed circles

mahesh says

April 19, 2017 @ 06:28

it is liked by the girls.

*it is used by the boys.

*it is completely hated by the parents…

Wat is that???

It must be in 6 letters.

—E—A—N

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