Friday, March 02, 2007

March 2007: Nine ways to eight

Create nine different mathematical expressions that equal 8. You must use the digits 2, 7 and one other. That other digit must be a 1 in the first expression, 2 in the next expression, and so on, up to 9. You can use a digit once and only once in each expression.

You may use the four arithmetic symbols: plus, minus, times, and divided by, as well as exponents and decimal points. You may use parentheses as you need them. For example: using the digits 2, 7, and 1 you can make the expression (2+7)-1= 8.