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Omni-MATH / The integer numbers from 1 to 2002 are written in a blackboard in increasing order 1,2,…,2001,2002. After that, somebody erases the numbers in the (3k+1)−th places i.e. (1,4,7,…). … · Discussion

Discussing The integer numbers from 1 to 2002 are written in a blackboard in increasing order 1,2,…,2001,2002. After that, somebody erases the numbers in the (3k+1)−th places i.e. (1,4,7,…). … · Omni-MATH

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