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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.


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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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