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Here is where I got this question.
International High IQ Society
It was on their "Ultimate IQ Test". The fish X finger problem Ringo gave was also on that test. The test I found impossible was their "Test for Exceptional Intelligence".
PairTheBoard
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I'm looking through the first couple here. I spent some time on #2, and I think I could solve this one. #1 I'm unsure how to even start (may be lack of any math background). The rest look pretty freaking hard. How long do you have to take this?