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Questions tagged [combinatorics]

A puzzle based on combinatorial mathematics, which is the study of finite or countable discrete structures.

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alphanumerical sequence

have tried to solve this sequence,I suppose that it has been created from the combination of a,b,c,d,e , That's the sequence: (a,c), ?, ?, ?, (a,e), ?, ?, (c,d), ?, (d,c) my logic: we just try to do ...