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Brandon is reading a book Flatland and notices that the product of the numbers of the two pages his book is open to has a units digit of 6. What is the units digits of the sum of the two pages numbers?

  • math -

    since the page numbers must be consecutive,
    the two pages can only end in 2 and 3

    e.g. 52 and 53 ---> 2 x 3 = 6

    so the sum must end in 5

    e.g. 52+53 = 105

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