Question

classify
the following into prime numbers and composite number
27, 29, 13, 18, 15, 47, 43, 49,26,31
​

Answer 1

Answer:

Prime numbers : 29, 13, 47, 43, 31

Composite numbers : 27, 18, 15, 49, 26

Answer 2

Given:

A set of numbers 27, 29, 13, 18, 15, 47, 43, 49, 26, and 31.

To Find:

Whether the numbers are prime or composite.

Solution:

1. A number is said to be a prime if it has only two factors which is the number 1 and the number itself.

For example, the number 7 is said to be prime as it has only two factors 1 and 7.

2. A number is said to be composite if it has more than two factors.

For example, the number 9 is said to be composite as it has more than two factors: 1, 3, 9.

3. The given set of numbers are 27, 29, 13, 18, 15, 47, 43, 49,26,31,

=> 27 has factors 1, 3, 9, and 27. Hence it is a composite number.

=> 29 has factors 1 and 29. Hence it is a prime number.

=> 13 has factors 1 and 13. Hence it is a prime number.

=> 18 has factors 1, 2, 3, 6, 9, and 18. Hence it is a composite number.

=> 15 has factors 1, 3, and 5. Hence it is a composite number.

=> 47 has factors 1 and 47. Hence it is a prime number.

=> 43 has factors 1 and 43. Hence it is a prime number.

=> 26 has factors 1, 2, 13, and 26. Hence it is a composite number.

=> 31 has factors 1 and 31. Hence it is a prime number.

Hence, the given numbers are classified as prime or composite.