There are 45 such numbers.
-2
17
72. (with the range of two digit numbers being from 10 to 99).
It would help to know which digit. 0 appears in 9 numbers and each of the others in 18 numbers.
1
The answer will depend on how many digits there are in each of the 30 numbers. If the 30 numbers are all 6-digit numbers then the answer is NONE! If the 30 numbers are the first 30 counting numbers then there are 126 combinations of five 1-digit numbers, 1764 combinations of three 1-digit numbers and one 2-digit number, and 1710 combinations of one 1-digit number and two 2-digit numbers. That makes a total of 3600 5-digit combinations.
45
All of them.
45 of them.
2
Ten.
All of the odd numbers between 11 and 99 inclusive are two digit numbers that are not multiples of 2. There are 45 of them.