It is 15
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11 and 13 are prime numbers but 15 is a composite number because it has more than two factors
13, 15
12, 14, 15, 16, and 18 are composite numbers 11, 13, 17, and 19 are prime numbers
The composite numbers between 11 and 19 are: 12 14 15 16 18 The other numbers, 11, 13, 17, and 19, are all prime.
9 and 15 are composite numbers because they have more than two factors