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7 November, 13:19

How many positive palindromic integers are 5 digits long 5-digit long and contain 7 or 8?

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  1. 7 November, 14:52
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    If the integers only contain digits 7 or 8 we have to consider 3-digit integers:

    777

    778

    787

    877

    788

    878

    887

    888

    The palindromes would then be:

    77777

    77877

    78787

    87778

    78887

    87878

    88788

    88888

    So there are 8 palindromic integers.
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