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The seventh book in the Harry Potter series has 759 pages. How many 2s were used when typing the page numbers?

  • math - ,

    From 0 to 99, there are 2*10=20 2's.
    from 100 to 199, there are 20 2's.
    from 600 to 699, there are 20 2's.

    From 700 to 759, there are 20-4 2's.

    How many 2's are there in all?

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