2, 4, 6, ..., 50; 25 numbers.
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All even numbers between 50 and 80 are composite.
prime numbers between 40 and 50: 41, 43, 47
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.
Since odd numbers are in a ratio of 1:2 it means for every one odd there will be one even, there would be 50 odd numbers between 1-100, and 50 even numbers. So 50%.
There are three prime numbers between 50 and 65: 53, 59, and 61