This problem can be solved by pre-school children in 5 to 10 minutes, by programmers in an hour and by people with higher education ..... well check it out yourself !
8809 = 6 5555 = 0
7111 = 0 8193 = 3
2172 = 0 8096 = 5
6666 = 4 1012 = 1
1111 = 0 7777 = 0
3213 = 0 9999 = 4
7662 = 2 7756 = 1
9313 = 1 6855 = 3
0000 = 4 9881 = 5
2222 = 0 5531 = 0
3333 = 0 2581 = ?
Answer
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2581 = 2
The pattern counts the number of circles in each 4 digit number.
For example, 0000 = 4 and 8888 = 8
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