Not even = odd.
1, 3, 5, 7, 9,
11, 13, 15, 17, 19
10 numbers (20 / 2 = 10).
There are 20 numbers in total from 1 to 20. The even numbers in this range are 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20, totaling 10 even numbers. Therefore, the probability of picking an even number is the number of even numbers divided by the total numbers, which is ( \frac{10}{20} = \frac{1}{2} ). Thus, the probability of selecting an even number is 0.5 or 50%.
-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