6 .....34, 35, 43, 45, 53, 54
I dot ow is thhe prolem
75431
There are none.Any number made by using the digits 0 to 9 once is divisible by 9 and so not a prime.There are none.Any number made by using the digits 0 to 9 once is divisible by 9 and so not a prime.There are none.Any number made by using the digits 0 to 9 once is divisible by 9 and so not a prime.There are none.Any number made by using the digits 0 to 9 once is divisible by 9 and so not a prime.
75431
The biggest 4 digit number that can be made from using the digits of 850236, using a digit at most once, is 8653.
97653.1
It could be: 54317
It is 3567
The largest even number that can be made with those digits is 9740 .
The largest odd number that can be made with those digits is 9407 .
3.........III
5040 numbers can be made.