Question

put a check by all the prime numbers.
your answer
5
11
13
15
23
28
none of the above

Explanation:

Step1: Recall prime number definition

A prime number is a positive - integer greater than 1 that has exactly two distinct positive divisors: 1 and itself.

Step2: Analyze 5

The factors of 5 are 1 and 5. So 5 is prime.

Step3: Analyze 11

The factors of 11 are 1 and 11. So 11 is prime.

Step4: Analyze 13

The factors of 13 are 1 and 13. So 13 is prime.

Step5: Analyze 15

The factors of 15 are 1, 3, 5, 15. So 15 is not prime.

Step6: Analyze 23

The factors of 23 are 1 and 23. So 23 is prime.

Step7: Analyze 28

The factors of 28 are 1, 2, 4, 7, 14, 28. So 28 is not prime.

Step8: Analyze "None of the above"

Since 5, 11, 13, 23 are prime, this option is incorrect.

Answer:

Check 5, 11, 13, 23.