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Kayaker
February 16th, 2013, 04:51
Code:




 8809 = 6    9881 = 5

 7111 = 0    7756 = 1

 2172 = 0    5555 = 0

 6666 = 4    8193 = 3

 1111 = 0    8096 = 5

 3213 = 0    1012 = 1

 7662 = 2    7777 = 0

 9313 = 1    9999 = 4

 0000 = 4    5531 = 0

 2222 = 0    6855 = 3

 3333 = 0    2581 = ?


This problem can be solved by pre-school children in 5-10 minutes,
by programmers in an hour and by people with higher education…
well, check it yourself!

peterg70
February 16th, 2013, 05:04
Interesting puzzle.


I have worked out its addition by substitution
i.e. 0 = 1, 1 = 0, 2 = 0, 3 = 0, 4 = ?, 5 = 0, 6 = 1, 7 = 0, 8 = 2, 9 = 1

dion
February 16th, 2013, 06:58
the answer is ....

2

bilbo
February 18th, 2013, 07:41
well, I would never solved it, but Google as usual is my friend...

http://wiki.answers.com/Q/If_8809_equals_6_and_7111_equals_0_and_2172_equals_0_and_6666_equals_4_what_is_2581_equal_to

NeOXOeN
February 18th, 2013, 10:22
i also googled for solution
Kayaker
February 18th, 2013, 12:28
This is kind of neat. I posted this from a discussion about creative thinking, how we need to discard old patterns and pre-conceived notions. Something I'm sure everyone realizes is at times useful to reversing. From the posts so far I see at least 3 different strategies to how you solved it (including google), and one I never considered. Here's the article:

http://codejury.com/what-genius-really-means/

I suspect there may even be "harder" and more complex ways to solve this. Captcha? Pattern recognition?