didu
08-29-2007, 08:03 AM
Apparently, the following site can read your mind:
http://www.learnenglish.org.uk/games/magic-gopher-central.swf
See if you can work out how they do it.
Hint 1:
Look carefully, not all the numbers have different symbols.
Hint 2:
Suppose your number is in the form of XY, then the number that you "randomly" select is calculated as X * 10 + Y - (X+Y) = 10X + Y - X - Y = 9X
In other words, it doesn't matter which 2 digits you choose to make up your random number, after their calculation, it's always going to be a multiple of 9 ... now have a look at all the symbols corresponding to multiples of 9 and see how they "read" your mind.
http://www.learnenglish.org.uk/games/magic-gopher-central.swf
See if you can work out how they do it.
Hint 1:
Look carefully, not all the numbers have different symbols.
Hint 2:
Suppose your number is in the form of XY, then the number that you "randomly" select is calculated as X * 10 + Y - (X+Y) = 10X + Y - X - Y = 9X
In other words, it doesn't matter which 2 digits you choose to make up your random number, after their calculation, it's always going to be a multiple of 9 ... now have a look at all the symbols corresponding to multiples of 9 and see how they "read" your mind.