Tell me how this works

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I know it's a silly e-mail forward, but I'm intrigued. How does it work? (I have little or no understanding of maths, so simple terms please.)

― Anna (Anna), Thursday, 13 March 2003 17:39 (twenty-three years ago)

Is that the one where you have to think of a number, do some maths, think of the symbol that has the number you're thinking of then the computer "guesses" the symbol?

If so, the maths ensures that all the numbers you could possibly be thinking of are multiples of 9. All the multiples of 9 have the same symbol next to them.

― caitlin (caitlin), Thursday, 13 March 2003 17:42 (twenty-three years ago)

it's all probably to do with the number 9.

― jel -- (jel), Thursday, 13 March 2003 17:44 (twenty-three years ago)

Caitlin - I've done it with differnt symbols.

― Anna (Anna), Thursday, 13 March 2003 17:46 (twenty-three years ago)

but it's very freaky.

― jel -- (jel), Thursday, 13 March 2003 17:46 (twenty-three years ago)

the symbol changes but there are so many answers you can get because of the number you are subtracting:

95 = 9 + 5 = 14 (95-14 = 81)
94 = 9 + 4 = 13 (94-13 = 81)
93 = 9 + 3 = 12 (93-12 = 81) etc

― jel -- (jel), Thursday, 13 March 2003 17:51 (twenty-three years ago)

Well, it might well have different symbols each time you do it. But, when you're doing it, look at 9, 18, 27, 36 and so on; they should all have the same symbol at the same time, even if it's a different symbol if you replay it.

― caitlin (caitlin), Thursday, 13 March 2003 17:51 (twenty-three years ago)

I think jel means "only so many"

― Andrew Farrell (afarrell), Thursday, 13 March 2003 17:54 (twenty-three years ago)

yeah only so many, thanks andrew.

― jel -- (jel), Thursday, 13 March 2003 17:58 (twenty-three years ago)

This is brilliant: you've done it with different symbols, but the multiples of 9 always have the same symbol as each _other_, but that symbol changes every time you reload.

― Andrew Farrell (afarrell), Thursday, 13 March 2003 17:59 (twenty-three years ago)

Doh! what caitlin said in other words.

― Andrew Farrell (afarrell), Thursday, 13 March 2003 17:59 (twenty-three years ago)

Maths attack: your number = 10x + y. The result = 10x + y - (x + y) = 10x - x = 9x!

― Andrew Farrell (afarrell), Thursday, 13 March 2003 18:03 (twenty-three years ago)

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