5678 is only one 4-digit number.
If you're willing to move the digits around to
different positions, you can make 23 more.
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Six - assuming 0123 does not count ... 1234 2345 3456 4567 5678 6789
-5674
There are 16 4-digit numbers that can be made up from 9 and 6.
The first digit can have 5 possible numbers, the second digit can have 4, the third 3, the fourth 2. 5
4,000 even numbers, 4,000 odd numbers.