Four Fours, the combinatorial maths challenge.
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A list of the first 100 answers (solutions 0 to 99) to the Four Fours problem.
A list of contributed answers (solutions above 99) to the Four Fours problem - there are some gaps.
Submit a Solution
If you can contribute a solution where we have none, then submit it here!
Links to other web pages dedicated to the Four Fours problem.