Somebody forwarded this math puzzle several days ago. Believe me it is quite challenging, especially for the math majors. 🙂 To those who want to exercise their brain muscles, you may want to check this out.

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

7777=0

9999=4

7756=1

6855=3

9881=5

5531=0

2581=?

By the way, please don’t post the answer.

After spending 10 minutes messing aroud with the numbers on excel I now have two options: I can either leave it be now or probably spend a good few hours on it.

Of course I will take neither option and let it linger in my mind for the next few days without any thorough mathematical analysis. Then again, past experience tells me that there’s a high liklihood that it’s one of those problems that requires a different persepective, not a thorough analysis.

I’m now spending time thinking what to do, when I could simply be getting on with it!

It’s not as “mathematical” as you think.

hint please 🙂

Hint: The pattern is not very “mathematical.” It can be solved by students in the early grades.

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I don’t like the use of equals signs in this puzzle. That gives a false impression; 8809 does not equal 6 in this puzzle. It would be better to say 8809 –> 6, 7111 –> 0, etc. I think the equals sign in misleading, not to mention wrong.

And, Guillermo, I used a VERY mathematical method to solve this problem. Wasn’t till after I completed my solution that I saw the not very mathematical method to which you refer.

Hi Patrick. What you say is really true. In fact, it was one of the reasons why it took me a long time to solve it. I should have changed it. Anyway, with that use of the equal sign, it is likely that the creator of the puzzle is not mathematically inclined.