2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40
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110
The sum of the first 20 even numbers... is 110
The first 20 odd numbers are: 13579111315171921232527293133353739.
2+4+6+8+10........+40=420
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%.