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Mind Reader

Kamangir | January 28, 2006 | Category Iran

This is from Sobhaneh (see). The mind reader (see) asks to choose a two-digit number and then look how it shows ab-(a+b). For a few minutes I was really astonished! How is it really working? The original flash is from (see).

Answer: ab-(a+b)=9a. See how all 9k numbers have the same symbol. The wise idea, though, is to change this symbol in every turn. Nice, isn’t it?

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