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6 of them.
There are 15180 combinations.
There are 5,461,512 such combinations.
To find the number of three-digit combinations, we consider the digits from 000 to 999. Each digit can range from 0 to 9, giving us 10 options for each of the three digits. Therefore, the total number of three-digit combinations is (10 \times 10 \times 10 = 1,000).
The answer is 10C4 = 10!/[4!*6!] = 210