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Bwahahahahahahaha!

the answer is always one of the following

9
18
27
36
45
54
63
81

these numbers always have the same symbol and that is always the correct answer
now if some math guru can explain the mathematics behind it
 
Originally posted by: alien42
the answer is always one of the following

9
18
27
36
45
54
63
81

these numbers always have the same symbol and that is always the correct answer
now if some math guru can explain the mathematics behind it
Click to expand...

:|

I was hoping it was some magic stuff... damn logical math type crap.
 
Originally posted by: alien42
the answer is always one of the following

9
18
27
36
45
54
63
81

these numbers always have the same symbol and that is always the correct answer
now if some math guru can explain the mathematics behind it
Click to expand...
Wrong - O!

 
I did it twice...it was right both times. 2 different symbols. I ended up with 27 and 72. :Q

/immediately begins construction of tinfoil hat
 
I figured that out a while ago after a few minutes of hard though.




I forget the exact math it used though and I'm way too lazy to figure it out again. So I'm off to play WoW.
 
the math behind it is rediculously easy

number = ab

10a+b - (a+b) = 9a = multiple of 9 from 9 to 81

all the multiples of 9 have the same symbol
 
ahahhaha i remember this. once you figure out how it works, you'll feel so retarted lol

EDIT: i can see that it's been already explained hehehe
 
I'm not sure what formula may be behind it (not sure how any formula can represent the digits within another number). But the highest number you can be subtracting is 18, 9+9. Every time you reduce your starting number by one (98), you reduce the additive number by one as well (17), so the answer will always be 81 if you're in the 90's; you never subtract more than the difference from your number to 81.

You forgot 72.

The same applies to every group of 10's, 10 to 19, 20 to 29, et cetera.
 
Not the same trick as above, but:


Think of a number, between 1-10

Multiply it by 9

Ad the first and last digits together*

Subtract 4 from the number.

You should have 5.


*That's the trick part, any number * 9, the numbers added together add up to 9 (or a multiple of 9 if we expand the range, then can do other manipulations to make end result 'known' ).


 
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