found a formula

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kennethkwek - 28 May 2006 10:28 GMT

This formula only apply to value that has only the digit 9 in it(e.g 9999 or 99999999). This is the formula:

{[(q-1)9]-8-[|(y-x)|9]-[(q-1)0]-1}
Where q is the smaller no. of two.
When both no. has the same value take q as that value.
y is the value of one no. while x is the other
Mutiply the number of digits, not the value.

Not sure whether this is correct or not, and not sure whether someone has discover this before me.

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matt271829-news@yahoo.co.uk - 28 May 2006 11:06 GMT

> This formula only apply to value that has only the digit 9 in it(e.g 9999 or 99999999). This is the formula:
>
> {[(q-1)9]-8-[|(y-x)|9]-[(q-1)0]-1}

Yes, you certainly have found a formula, but a formula for *what*? You
forgot to explain that!

It would also be a good idea to explain your notation. For example,
what is "(q-1)0" supposed to mean? (Not (q-1)*0, I assume...)

> Where q is the smaller no. of two.
> When both no. has the same value take q as that value.
> y is the value of one no. while x is the other
> Mutiply the number of digits, not the value.

In the context of the above expression I have no idea what "mutiply the
number of digits, not the value" means.

> Not sure whether this is correct or not, and not sure whether someone has discover this before me.

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Math Forum / Mathematics / Undergraduate Math / May 2006

found a formula