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Using the digits of 1345678, there are 210 three digit numbers in which no digit is repeated.
987,653
500
It is 120 if the digits cannot be repeated.
There are only two smaller 3-digit numbers and both of them have repeated digits.
It is possible to create a 3-digit number, without repeated digits so the probability is 1.
757
Using the digits of 1345678, there are 210 three digit numbers in which no digit is repeated.
9x9x8x7x6x5x4x3 =1632960
987,653
5040 different 4 digit numbers can be formed with the digits 123456789. This is assuming that no digits are repeated with each combination.
27 three digit numbers from the digits 3, 5, 7 including repetitions.
24
500
There are 5*4*3 = 60 such numbers.
There are 4 possible numbers if the digits are not repeated; 18 if they are. Those are 3-digit numbers, assuming that zero would not be a leading digit. If zero is allowed for a leading digit, then you can have 6 for the non repeated, and 27 if repetition.
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