54
995
It is 58.
If repeated digits are allowed, then the largest 12-digit number is 999,999,999,999 .If repeated digits are not allowed, then the largest 12-digit number is 989,898,989,898 .If the same digit can't be used more than once, then the largest possible number has only10 digits. The number is 9,876,543,210 .
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
54
A) If a number has two digits, then the sum of its digits is less than the value of the original two-digit number.
17
83 A+
19
45
46.
The original number is 58.
39
995
To total 17 the two digits must be 8 and 9! The original number was 98.
52488