999
The biggest 4 digit number that can be made from using the digits of 850236, using a digit at most once, is 8653.
-4790281
The greatest 9-digit number using three different digits is 999888777, formed by using the digits 9, 8, and 7 in descending order. The smallest 9-digit number using three different digits is 100000000, created with the digits 1, 0, and 0. This arrangement ensures that the number starts with 1, followed by the zeros to maintain the smallest value.
Assuming each digit only once: 65432 (and no further mathematical operations).
It is: 63,477
8,754,321
531
8643
9531
The biggest 4 digit number that can be made from using the digits of 850236, using a digit at most once, is 8653.
-4790281
3201
9876543210
9+3-1
972.
Using those three digits it is 145.
Assuming each digit only once: 65432 (and no further mathematical operations).