Question

what are the first 7 prime numbers?
3, 5, 7, 11, 13, 17, 21
2, 5, 7, 11, 13, 15, 17
2, 3, 5, 7, 11, 13, 17
1, 3, 7, 11, 13, 17, 19

Explanation:

Step1: Recall Prime Number Definition

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

Step2: Analyze Each Option

• First option: 21 is divisible by 3 and 7, so not prime. Eliminate.
• Second option: 15 is divisible by 3 and 5, so not prime. Eliminate.
• Third option: 2 (divisors 1,2), 3 (1,3), 5 (1,5), 7 (1,7), 11 (1,11), 13 (1,13), 17 (1,17) are all primes.
• Fourth option: 1 is not a prime (by definition, primes >1). Eliminate.

Answer:

C. 2, 3, 5, 7, 11, 13, 17 (assuming the third option is labeled C; if labels are different, adjust to the correct identifier with the text "2, 3, 5, 7, 11, 13, 17")