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.

Actually, there are 46 such subsets, since each one that you listed could also be relisted with 0 included.

Posted by DJ on 2003-05-22 11:48:56