Question

write three pairs of prime numbers less than 2o whose the sum is dvisible by 5

Answer 1

(2,3), (3,7) and (13,2)

Answer 2

prime no are 2,3,5,7,11,13,17,19
sum divisible of 5
2+3
7+13
3+7
13+17
17+3
13+2
11+19