Write five pairs of prime numbers less than 20 whose sum is divisible by 5 (Hint: 3 + 7 = 10)

Solution:

We will be using the concepts of prime numbers to solve this.

Required pairs of prime numbers less than 20 and whose sum is divisible by 5 are:
(i) 2 + 3 = 5 (5/5 = 1. Thus, it is divisible by 5)
(ii) 2 + 13 = 15 (15/5 = 3. Thus, it is divisible by 5)
(iii) 11 + 9 = 20 (20/5 = 4. Thus, it is divisible by 5)
(iv) 17 + 3 = 20 (20/5 = 4. Thus, it is divisible by 5)
(v) 7 + 13 = 20 (20/5 = 4. Thus, it is divisible by 5)

NCERT Solutions Class 6 Maths Chapter 2 Exercise 3.2 Question 11

Write five pairs of prime numbers less than 20 whose sum is divisible by 5. (Hint: 3 + 7 = 10)

Summary:

Five pairs of prime numbers less than 20 whose sum is divisible by 5 are 2 and 3, 2 and 13, 11 and 9, 17 and 3, and 7 and 13.

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