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How do you?

 
 
kev
 
Reply Fri 20 Jan, 2006 01:25 pm
How do you arrive at a figure of -10 (minus 10) having used all numbers between 1 and 9 but only adding or subtracting?
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Type: Discussion • Score: 1 • Views: 587 • Replies: 6
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zerone
 
  1  
Reply Fri 20 Jan, 2006 02:36 pm
including 1 and 9 ?
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whimsical
 
  1  
Reply Fri 20 Jan, 2006 05:36 pm
-13+5+7-2+4+6-8-9
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kev
 
  1  
Reply Fri 20 Jan, 2006 07:45 pm
zerone wrote:
including 1 and 9 ?


Thats how I'm looking at it zerone.


Your answer works Whim but I'm not sure you can use double figures (13)
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markr
 
  1  
Reply Fri 20 Jan, 2006 10:57 pm
You have to be able to combine figures, or it can't be done. 1+2+...+8+9 = 45 If you constrain yourself to the integers 1-9, the subtracted integers must sum to -27.5, and the added integers must sum to 17.5. Can't be done with integers.
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Individual
 
  1  
Reply Sat 21 Jan, 2006 12:02 am
Kev, it can't be done. You will always come up with an odd number no matter what you do.
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kev
 
  1  
Reply Sat 21 Jan, 2006 01:21 pm
Thanks everybody Very Happy
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