I believe it is 10,000 seeing as to there is 10 digits to choose starting from zero and ending with nine so it would be 104 which is 10x10x10x10 and is equal to 10,000
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625 if numbers can have leading 0s, 500 otherwise.
Total possible 4-digit numbers= 1000, 1001,...,9999 = 9000 Total with same digit numbers = 1111,2222,...,9999 = 9 9000 - 9 = 8991
There are 12 such numbers.
9,000
There are 4,500 combinations.