[Ruby Quiz <james / grayproductions.net>, 2007-04-06 14.55 CEST]
[...]
> The NPR show "Car Talk" has regular quizzes that they call "Puzzlers"[1]. The
> one listed on their web site for March 12th[2] is titled "Getting to 100". In
> the quiz, you are supposed to write down the digits 1-9 in order, followed by "
> = 100", and then insert between them two minus symbols and one plus symbol (in
> any order) to make the formula correct. You aren't allowed to re-arrange digits,
> or do some toothpick math like combine two minus signs to make a plus. You must
> use every digit, and all three operators.

Can the plus and minus symbols be used as unary operators?

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