How many combinations can you choose from the ten numbers 0-9 to make up different six digits
The first digit has 1.2.9 digits, including 9 kinds
The second digit has 9 digits except the first digit, 9 kinds in total
The third digit has 8 digits except the first and second digits, and there are 8 kinds in total
.
So there are six different digits
9 * 9 * 8 * 7 * 6 * 5 = 136080 species
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