a/bc + d/ef + g/hi = 1
Each of three fractions has a one-digit numerator and a two-digit
denominator. The three fractions together add up to one. Place the
nine digits 1-9 into the fractions to make the equation correct.
Source: Nob Yoshigahara, c/o Scot Morris in OMNI, April 1994.
Used as Ken's POTD 4/14/94.
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