Question

write five pairs of odd prime numbers less than 20 whose sum is divisible by 4

Answer 1

Answer:

1,3

3,5

7,9

9,11

11,13

15,17

can be the answer

Answer 2

Answer:

Odd prime nos.- 3,5,7,11,13,17,19

7+13=20 i.e. 4×5

11+5=16 i.e. 4×4

7+5=12 i.e. 4×3

5+3=8 i.e. 4×2

17+3=20 i.e. 4×5

13+3=16 i.e.4×4

These are some pairs of odd prime nos.

Hope it helps!