How many numbers between 2016 and 5016 can be formed using the digits 2, 4, and 8, if these digits are allowed to be repeated?
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The first digit can only be 2 or 4. The remaining 3 digits can be any of the three digits, so that’s 3³=27 different numbers. There will be 27 beginning with 2 and 27 beginning with 4, making 54 altogether.

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