I came across a wonderful puzzle. It presents a sequence of equalities and requires you to deduce the answer to an incomplete equality. Here’s the set of equalities :
8809 = 6
7111 = 0
2172 = 0
6666 = 4
1111 = 0
3213 = 0
7662 = 2
9312 = 1
0000 = 4
2222 = 0
3333 = 0
5555 = 0
8193 = 3
8096 = 5
7777 = 0
9999 = 4
7756 = 1
6855 = 3
9881 = 5
5531 = 0
All you have to do is to determine the value of
2851 = ?
Apparently people with good mathematical background are having difficulties solving this problem, whereas people with almost no mathematical abilities can easily figure out the answer !!! I took it as a challenge and found myself incapable of deducing the answer. I forwarded the question to a few friends of mine, and none was able to solve the question (probably thus indicating that we are good mathematicians 
).
We gave up and decided to peek at the comments to know the solution. And the solution astonished us. Indeed, there was no mathematical logic involved in this quiz ! All that was required was a simple observation skill. Hope you have better luck solving this one than we had.
Here’s the link to the authors page : Finish This Sequence Of Equalities
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