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Using the digits 1, 2, 3, 4, 5, how many even three-digit numbers less than 500 can be formed if each digit can be used at most once?

 Jan 10, 2022
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Even numbers must end in 2 or 4

   first number must be 1 2 3  or  4

         ends in 4     x  y   4        x = 3 choices    y = 3      3*3 = 9 choices

         ends in 2     x y    2        x = 3 choices    y = 3      3*3 = 9 choices                    18 even numbers between 100- 500

 Jan 10, 2022

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