Every number between 1000 and 9999 inclusive. Also every number between -1000 and -9999 inclusive.
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Interesting.Social Security numbers all have the form: (3 digits) - (2 digits) - (4 digits).That's 9 digits altogether. If you ignore the dashes, you get: xxx,xxx,xxx .With 9 places, there are 1 billion possible different numbers.
5555
Without repeats there are 4 × 3 = 12 possible 2 digit numbers. With repeats there are 4 × 4 = 16 possible 2 digit numbers.
456, 546 and 564 are three of the four possible even numbers.
1344