How many prime numbers are there between 1 and 20?

• A. 6
• B. 7
• C. 8
• D. 10

Answer: (C)

To determine the number of prime numbers between 1 and 20, it is important to understand what a prime number is. A prime number is defined as a natural number greater than 1 that has no positive divisors other than 1 and itself.

Counting the prime numbers within the range of 1 to 20, we find the following:

• The prime numbers are: 2, 3, 5, 7, 11, 13, 17, and 19.

When we list them, we see that there are exactly eight numbers:

1. 2 (the only even prime),

2. 3,

3. 5,

4. 7,

5. 11,

6. 13,

7. 17,

Since this list contains eight numbers, the correct total of prime numbers between 1 and 20 is indeed eight. Therefore, identifying that there are 8 prime numbers provides a clear understanding of how prime numbers are defined and counted within a specific range.