17 of them.
5.
11
All of them. There are roughly 45,000 5-digit odd numbers. None of them end in 0.
There are 50.
50
17 of them.
There are 101 numbers between 0 and 100. Because it starts with an even number and ends with an even number, there is 1 less odd number than even. So 51 even and 50 odd.
If you consider row 0 as the row consisting of the single 1, then row 100 has 6 odd numbers.
All of them. 100%. All prime numbers are odd numbers. (The exception being the number 2)
9 odd numbers less than 100 can be formed. They are: 3,5,7,35,37,53,57,73 and 75.
5.
50
50 of them.
There are 99 numbers between 0 and 100.
All of the odd numbers in that range can be factors.
11