All even numbers are composite, because 2 is a factor of every even number.
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All even numbers other than 2 are composite, so the even composite numbers between 30 and 50 are 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, and 50.
The composite numbers between 20 and 30 are: 20 21 22 24 25 26 27 28 30
The composite numbers between 30 and 40 are 32, 33, 34, 35, 36, 38, and 39.
The composite numbers between 20 and 30 are 21, 22, 24, 25, 26, 27, and 28.
30, 32, 33, 34, 35