Add them up.
50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65, 66, 68, 69, 70
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The sum is 75.
The sum of 5 composite numbers can be either composite, or prime, depending on the case.
What is the sum of the composite numbers less than 10?4 + 6 + 8 + 9 = 27
50
39