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Not all numbers between 20 and 28 are composite numbers. 23 is a prime number.
The composite numbers between 30 and 40 are 32, 33, 34, 35, 36, 38, and 39.
Apart from 2, all even numbers are composite. So the question is equivalent to all even numbers between 40 and 50. And these are ... ? 42, 44, 46 and 48.
All even numbers are composite, because 2 is a factor of every even number.
39