(9/3 + 6)*1 = 9
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Without repeated digits, the answer is 7*6*5*4*3 = 2520
151200 numbers.
24
654321-100000= 554321 combinations
If you use them only once each, you can make 15 combinations. 1 with all four digits, 4 with 3 digits, 6 with 2 digits, and 4 with 1 digit. There is also a combination containing no digits making 16 = 24 combinations from 4 elements.