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Q: Which of these numbers is not composite 15 18 19 20 21?

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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.

They are: 8+9+10+12+14+15+16+18 = 102

13, 15

Prime numbers: 11, 13, 17, 19, 23, 29 Composite numbers: 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30

Related questions

The composite numbers between 11 and 19 are 12, 14, 15, 16 and 18

They are: 12, 14, 15, 16 and 18

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.

It is: 12+14+15+16+18 = 75

15 is composite number 17, 19 and 23 are prime numbers.

It is 15

They are: 8+9+10+12+14+15+16+18 = 102

18 (All even numbers except 2 are composite.)

13, 15

They are 15, 16, 17, 18 & 19.

15

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