Question

Write three pairs of prime numbers less than 20, whose sum is divisible by 5.
​

Answer 1

Answer:

The sum of the prime numbers 3 and 17 is 20 and 20 is divisible by 5. The sum of the prime numbers 13 and 17 is 30 and 30 is divisible by 5. The sum of the prime numbers 2 and 13 is 15 and 15 is divisible by 5. Hence, the pairs are (2, 3), (3, 7), (7, 13), (3, 17), (13, 17), and (2, 13).