40
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All even numbers are composite, because 2 is a factor of every even number.
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 of them except for 31, 37, 41, 43 and 47 which are prime numbers
51
prime: 31, 37, 41, 43, 47 composite: the others