Question

put a check by all the prime numbers.
3
9
12
14
16
21
none of the above

Explanation:

Step1: Recall prime number definition

A prime number is a number greater than 1 that has no positive divisors other than 1 and itself.

Step2: Check each number

• For 3: Divisors are 1 and 3, so it's prime.
• For 9: Divisors are 1, 3, 9 (3×3 = 9), not prime.
• For 12: Divisors include 1, 2, 3, 4, 6, 12, not prime.
• For 14: Divisors include 1, 2, 7, 14, not prime.
• For 16: Divisors include 1, 2, 4, 8, 16, not prime.
• For 21: Divisors include 1, 3, 7, 21, not prime.

Answer:

The checkbox next to 3 should be checked. So the answer is the option with "3" (the first checkbox in the list).