All nines
9,999,999,999
Guessing 10 000. The zeros count as a digit. The greatest possible is 99 999. =)
910
10
The smallest is 10 and the greatest is 99.
The greatest 3-digit number that is not divisible by 2, 3, 5, or 10 is 997.
In a proper fraction the numerator is smaller than the denominator. Since every two-digit number is larger than every one-digit number, there must be a one-digit numerator and two-digit denominator comprising 3 digits total. The greatest fraction will be the one with the largest possible numerator and smallest possible denominator. Choose a numerator of 9 (the largest one-digit number) and a denominator of 10 (the smallest 2-digit number). All 3 digits are different. The answer is 9/10.
2
990
There is no limit to the number of digits.If, for example, a X is a k-digit number which is divisible by 4 then 10*X is divisible by 4 and 10*X will be a (k+1)-digit number.
10/99 = 0.1010... (repeating)
10 because 10 is the first 2 digit number out of all numbers.
10