The composite numbers between 30 and 40 are 32, 33, 34, 35, 36, 38, and 39.
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The composite numbers between 20 and 30 are 21, 22, 24, 25, 26, 27, and 28.
All of them except 23 and 29 which are prime numbers
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.
All even numbers are composite, because 2 is a factor of every even number.
The only prime number in that range is 29. All others are composite.