Question

Find the ratio of the number of prime numbers and the number of composite numbers from 1 to 10

• A. 1:1
• B. 4:5
• C. 3:7
• D. Cannot be determined

Answer 1

The correct option is B 4:5

By definition, ONLY natural numbers can be prime or composite.
Natural numbers start from 1.
1 is NEITHER a prime NOR is it a composite number.
The prime numbers are 2, 3, 5, and 7, i.e., 4 prime numbers.
The composite numbers are 4, 6, 8, 9, and 10, i.e., 5 composite numbers.
So, the required ratio = 4:5.