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Add down to One (Posted on 2003-05-21) Difficulty: 3 of 5
The numbers 0-9 are lined up in a row, like this:

0 1 2 3 4 5 6 7 8 9

You have to put in + and - signs in the blanks, so that in the end it will all equal 1.

Also, if possible, try to make expressions resulting in 0 and -1.

  Submitted by Jonathan Waltz    
Rating: 2.5000 (6 votes)
Solution: (Hide)
0+1-2-3-4+5-6-7+8+9=1

Negative one is possible by reversing all the signs above.

Zero is not possible - there are five odd numbers (1,3,5,7,9), and they will always add up to and odd. The other numbers are even, and adding them to an odd number will keep the sum odd. Since 0 is even, it cannot be achieved.

Comments: ( You must be logged in to post comments.)
  Subject Author Date
Some ThoughtsPuzzle ThoughtsK Sengupta2022-09-06 00:45:22
re(2): Solution plusCharlie2003-06-05 09:58:15
SolutionSolution (it is easy)Alpha Tiger2003-05-27 00:12:18
re(4): SolutionSanjay2003-05-23 14:28:47
re(3): SolutionDJ2003-05-22 11:48:56
re(2): Solution plusBryan2003-05-22 09:52:40
re: Solution plusCharlie2003-05-22 06:52:24
re(2): SolutionSanjay2003-05-22 05:29:24
Solutionre: SolutionDave Neary2003-05-22 03:28:29
re(2): SolutionSanjay2003-05-21 22:12:17
MaybeGamer2003-05-21 09:57:29
re(3): Solution plusCharlie2003-05-21 09:33:35
re(2): Solution plusBryan2003-05-21 09:16:50
re: Solution plusChris2003-05-21 08:58:39
SolutionSolution plusBryan2003-05-21 04:57:12
re: Solutionpeter2003-05-21 03:00:21
SolutionSolutionSanjay2003-05-21 02:23:42
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