Sunday Puzzle of Feb 18
Challenge for February 18: The object of this challenge is to develop nine different mathematical expressions that equal eight. You must use the digits 2, 7 and one other. And that other digit must be a one in the first expression, two in the next expression and so on, up to nine. 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 parenthesis as you need them. For example: Using the digits 2, 7 and 1 you can make the expressions 2+7-1= 8.
It’s too late, of course, to actually submit this (though I never do anymore), and I’m embarrassed by how long it took me (even with Plagioclase’s help), but my answers are below the fold. The only excuse I’ll give is that I was away for several days. It wasn’t just that I was dense or anything, oh no.
RSSers look away!
- 2 + 7 - 1 = 8
- 2/2 + 7 = 8
- 3 + 7 - 2 = 8
- 2^(7-4) = 8
- .2 * 5 + 7 = 8
- 2 * 7 - 6 = 8
- 7/.7 - 2 = 8
- 7.2 + .8 = 8
- 72/9 = 8
