65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80
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The composite numbers between 70 and 80 are 72, 74, 75, 76, 77 and 78.
The composite numbers between 50 and 80 are: 50, 51, 52, 54, 55, 56, 57, 58, 60 62, 63, 64, 65, 66, 68, 69, 70, 72 74, 75, 76, 77, 78, 80
All even numbers between 50 and 80 are composite.
62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77 and 78.
81, 82, 84, 85, 86, 87, 88. 80 and 90 are composite too