5.
Fifty.
There are 50 odd numbers between 0 and 99. These numbers are 1, 3, 5, 7, and so on, up to 99. The sequence of odd numbers can be represented as 2n + 1, where n ranges from 0 to 49. Thus, the total count of odd numbers is 50.
11
All of them. There are roughly 45,000 5-digit odd numbers. None of them end in 0.
There are 25 of them.
50
Fifty.
50 of them.
All of the odd numbers in that range can be factors.
A whole number has an odd number of unique factors if and only if it is a perfect square. The perfect squares less than 10 are 0, 1, 4, and 9. Therefore, there are four whole numbers less than 10 that have an odd number of unique factors.
11
All of them. There are roughly 45,000 5-digit odd numbers. None of them end in 0.
There are 25 of them.
There are 19 numbers between zero and 365 that have an odd number of factors.
50
17 of them.
0 is an even number because it is between two odd numbers.