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Omni-MATH / Let p be an odd prime number. How many p-element subsets A of 1,2,…,2p are there, the sum of whose elements is divisible by p? · Discussion

Discussing Let p be an odd prime number. How many p-element subsets A of {1,2,…,2p} are there, the sum of whose elements is divisible by p? · Omni-MATH

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