The composite numbers between 10 and 20 are 12, 14, 15, 16 and 18.
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The composite numbers that are between 1 and 20 inclusive are: 4 6 8 9 10 12 14 15 16 18 20 This is a total of eleven composite numbers equal to 20 and below.
12,14,15,16, and 18
There are 7 composite numbers from 10 to 20 (including the boundaries):10, 12, 14, 15, 16, 18 and 20
composite numbers between 0-20: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18
10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25