10*9*8*7*6=30,240
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9x8x7x6x5x4x3x2x1 or 9! which equals 362880 possible combinations if no digits are repeated
If you include 0000, ten thousand unique four digit codes are possible.
9876
98765432
The largest number with no repeated digits is 9,876,543,210 although it is 10 digits long, the largest 3 digit number with no repeated digits is 987