Answer:
30,240
Explanation:
For the first digit: 10 options
For the second: 10 - 1 = 9 options
For the third: 9 - 1 = 8 options
For the fourth: 8 - 1 = 7 options
For the fifth: 7 - 1 = 6 options
10×9×8×7×6
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