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The use of set terminology here should not hold anyone up as they can find the definition in the Thesaurus. This is an exercise in combinatorics and it also gives a method for solving the problem about the sequence of subsets.

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The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice.

NRICH is part of the family of activities in the Millennium Mathematics Project.

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