9,999,876 is the greatest seven-digit number using four different digits.
987654
99874To solve this type of problems, you go from left to right, using the largest possible digit in every case.
7,543
97531
9,999,876 is the greatest seven-digit number using four different digits.
987654
99874To solve this type of problems, you go from left to right, using the largest possible digit in every case.
To be an even number then the final digit = 2. The largest single prime digit is 7 (as both 8 and 9 are composite). The greatest even number fulfilling the conditions is 77777772.
7,543
97531
Proceed from left to right, using the largest possible digit in each position.
1080, 9989
smallest=1234 greatest=4321
1023
9542
.961