These answers are not picking up on the key word in your question: "between". If we're counting between 1 and 100, then we by definition do not count 1 (even though, as mentioned, it is an odd number). No other possible odd numbers are affected by this since 100 is an even number. So the answer is 49.
Including the number 1, the odd numbers between 1 and 100 are:
1 3 5 7 9 11 13 15 17 19
21 23 25 27 29 31 33 35 37 39
41 43 45 47 49 51 53 55 57 59
61 63 65 67 69 71 73 75 77 79
81 83 85 87 89 91 93 95 97 99
This is a total of 50 numbers.
The product of two odd numbers is always an odd number.
17,19,21
The maximum numbers are 2n if n is even and n if n is odd. There will be far fewer if the n-gon is not regular.
Let's take a look at this. For any integer n, 2n always be even, then the next consecutive number 2n + 1 must be odd. Let add them first, 2n + 2n + 1 = 4n + 1 = 2(2n) + 1 So their sum is odd, since every even number multiplied by 2 is also even. Let's multiplied them, 2n(2n + 1) = (2n)^2 + 2n Their product is even, since every even number raised in the second power is also even, and the sum of two even numbers is even too. So the answer is that when the sum of two numbers can be odd, their product is an even number. (note that the sum of two odd numbers is even)
Easily. Indeed, it might be empty. Consider the set of positive odd numbers, and the set of positive even numbers. Both are countably infinite, but their intersection is the empty set. For a non-empty intersection, consider the set of positive odd numbers, and 2, and the set of positive even numbers. Both are still countably infinite, but their intersection is {2}.
There are 40 odd numbers between 20 and 100. Remember that an odd number is every second number. There are 80 numbers between 20 and 100, so there are 40 odd numbers and 40 even numbers.
50
50
50
450
30
101103107109 and 113
300
200
101
Draw a flowchart to generate odd numbers between 100?
50