which number is composite? 15 17 19 23
which number is composite? 15 17 19 23
Answer
Explanation:
Step1: Recall prime - composite definition
A prime number has only 1 and itself as factors. A composite number has more than two factors.
Step2: Analyze 15
The factors of 15 are 1, 3, 5, 15. Since it has 4 factors, it is composite.
Step3: Analyze 17
The factors of 17 are 1 and 17. It is prime.
Step4: Analyze 19
The factors of 19 are 1 and 19. It is prime.
Step5: Analyze 23
The factors of 23 are 1 and 23. It is prime.
Answer:
15