9,999,876 is the greatest seven-digit number using four different digits.
The greatest 4-digit number with no repeated digits is... 9876
That would be 99987.
9876 and 1234
The greatest number is 7.
The greatest 3 digit number is 999, and all three digits are the same.
In order to make the number as big as possible, you would want the greatest value digits in the greatest place value. Thus the first number would have to be 9. Once 9 has been used, the second number would have to be 8. Then the third number would have to be 7 and so on. Therefore, the greatest 9 digit number with 9 different digits is 987,654,321.
102 is the smallest three digit number with different digits.
It can have up to 5 digits.
8642 is the greatist number if all the numbers are not the same and even
smallest 8 digit number with three different digits
Any 5-digit number is greater than a 4-digit one.
9876 is the largest four digit number you can make if all the digits must be different.