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'Racing Odds' printed from http://nrich.maths.org/
An elephant, a hippopotamus and a rhinoceros are entered for a
race. The odds for the rhinoceros and the hippopotamus are:
2 to 1 against the rhinoceros winning and
3 to 2 against the hippopotamus winning.
What are the odds against the elephant winning if the race?
Editor's note: The hint explains 2 to 1 against in fractional