This article is from the Puzzles FAQ, by Chris Cole chris@questrel.questrel.com and Matthew Daly mwdaly@pobox.com with numerous contributions by others.
Form an expression that evaluates to 24 that contains two 3's, two 7's,
and zero or more of the operators +, -, *, and /, and parentheses. What
about two 4's and two 7's, or three 5's and one 1, or two 3's and two 8's?
arithmetic/digits/equations/24.s
7*(3+3/7)
7*(4-4/7)
5*(5-1/5)
8/(3-8/3)
 
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