Two Plus Two Older Archives OT: brain teaser
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#1
11-29-2005, 03:06 AM
 lastsamurai Senior Member Join Date: Mar 2005 Location: la la land Posts: 222
OT: brain teaser

http://trunks.secondfoundation.org/files/psychic.swf First person to figure this out gets um....respect?
#2
11-29-2005, 03:23 AM
 legend42 Member Join Date: Mar 2004 Posts: 56
Re: OT: brain teaser

"number 9, number 9, number 9...."
#3
11-29-2005, 04:06 AM
 MCS Senior Member Join Date: Sep 2002 Posts: 143
Re: OT: brain teaser

Legend42 gave a good answer. [img]/images/graemlins/smile.gif[/img]

Let T be the tens digit and U be the units digit of the number you pick. Then TU is equal to (10*T + 1*U). Now your calculation is:

(10T + U) - (T + U) = 9T

So the answer is always a multiple of 9, and is at most 9*9=81. If you look at the chart, you'll see that all the multiples of 9 up to 81 have the same symbol, which is what the crystal ball displays.

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