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There are no three didgit numbers but there are 63 three digit numbers.
Using the digits of 1345678, there are 210 three digit numbers in which no digit is repeated.
There are 898 three-digit even numbers. Nine of them are multiples of 55. That leaves 889 * * * * * There are 450 three-digit even numbers and 17 of them are multiples of 55. So that leaves 433.
There are 17 such numbers.
There are 900 three-digit numbers.