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math

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how many 7 digit telephone numbers can be made if every other digit is even

  • math -

    Not sure if the 7 digit can start with a zero, looked at my phone book and couldn't find any

    could be
    EOEOEOEOE , assuming the 0 with the evens
    number = 4x5x5x5x5x5x5 = 4x5^6 = 62500

    or could be
    OEOEOEO
    number = 5^7 = 78125

    for a total of 140625

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