60, 62, 63, 64, 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.
Between 60 and 70 the composite numbers are: 62, 63, 64, 65, 66, 68, 69. 60 and 70 are also composite.
60 and 30