Quote:
Originally posted by Souled Out
He got my number right what the **** 
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This is a neat trick, but the way it works is by first letting you solve some simple equations, the last one being a substraction. Then he shows you the numbers 5 and 12, and you have to be quick...
12 - 5 = 7
I also got 7, but I instantly realized why I got 7. My mind was still in "substraction mode". This is why, on average, a lot more people choose 7.
It's a really cool trick though!