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DK-GEORGMOHR 1996 Problem 4

    Regarding a natural number nn , it is stated that the number n2n^2 has 77 as the second to last digit. What is the last digit of n2n^2 ?

    Dataset text AI-MO AoPS. Quoted with source.

    Official text: Georg Mohr Contest 1996 official paper, page 1.

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