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10
Using the digits of 1345678, there are 210 three digit numbers in which no digit is repeated.
It is 99,887,765
102
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
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10
Using the digits of 1345678, there are 210 three digit numbers in which no digit is repeated.
It is 99,887,765
102
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
The first digit can be 0 through 9, ten possibilities. Having selected the first digit, you have 9 digits to pick from the second digit. Having selected the second digit, you have 8 digits to pick from the third digit. Hence total possibilities = 10 x 9 x 8 = 720
It is possible to create a 3-digit number, without repeated digits so the probability is 1.
Repeated twice means we're allowed three of them. That would be 88,866,644. If you really meant repeated, that would be 88,664,420
The largest single digit in our numerical system is 9. Once you write 10, you have two digits.
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