6561
763920
2016/4000 = 0.504
5 digit telephone numbers having at least one of their digits repeated is = total possible 5 digit telephone numbers - 5 digit telephone numbers without any digit being repeated. =(10*10*10*10*10)-(10*9*8*7*6) =100000-30240 =69760
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
It is possible to create a 3-digit number, without repeated digits so the probability is 1.
763920
2016/4000 = 0.504
5 digit telephone numbers having at least one of their digits repeated is = total possible 5 digit telephone numbers - 5 digit telephone numbers without any digit being repeated. =(10*10*10*10*10)-(10*9*8*7*6) =100000-30240 =69760
The largest ten digit number with no repeated digits is '9876543210'.
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
The largest ten digit number with no repeated digits is '9876543210'.
987654
1023456789
None of the digits can be 10, so the probability is 0.
The greatest 4-digit number with no repeated digits is... 9876