Not even = odd.
1, 3, 5, 7, 9,
11, 13, 15, 17, 19
10 numbers (20 / 2 = 10).
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-99
The only even prime number is 2.
Even numbers account for 50% of the numbers from 1 to 50.
50%, or 1 out of 2. There are 12 numbers, 6 even and 6 odd, so they have equal chance of being odd or even if one is selected
even numbers 1-100