Put the appropriate plus or minus signs between the numbers, in the correct places so that the sum total will equal 1.
0 1 2 3 4 5 6 7 8 9 = 1
Can you make the same numbers sum to -1 by changing only one plus or minus sign?
0 1 2 3 4 5 6 7 8 9 = -1
want the Solutions? Think you have it and want to check?