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The flash mind reader has you compute a number in your head.  You note the symbol next to the number you compute.  You then click the crystal ball and it returns the symbol you were thinking of.  This is a classic "force card" trick. Let's compute the number:

When you pick 10a+b    you pick   a & b

Then they have you calculate 

10a+b -(a+b) = 9a   Thus your result will be limited to 1,9,18….99   They got lazy and did not go to 100 ah ha!  They could have as easily just told you to take the tens digit and multiply by 9.  But then you would have seen immediately that your end result is limited to only 10 values.

So when the page comes up these values all have the same symbol next to them. The rest of the numbers will never be arrived at so they can obscure their subterfuge by allowing the symbols associated with those numbers to be random.  When you click on the crystal ball it pops up the symbol next to the 9a force numbers and the illusion is complete.

Categories: Math

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