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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?
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)
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.
Kev, it can't be done. You will always come up with an odd number no matter what you do.