# How many four-digit even numbers can be formed using the digits 3,4,7,8 if digits may be repeated?

128

Using the digits, any number ending with the 4 or the 8 will be even.

For a number ending in the 4, the other three digits can be any one of the 4 numbers we are allowed. And so there are:

The same is true for when the number ends in 8.

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