Question

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

Answer 1

$\text{Five pairs of prime numbers less than}$ $\text{20 whose sum is divisible by 5, are:}$


$\text{ 1.) \: \: \: \: \: 3 + 2 = 5}$



$\text{ 2.) \: \: \: \: \: 13 + 7 = 20}$



$\text{ 3.) \: \: \: \: \: 13 + 2 = 15 }$



$\text{ 4.) \: \: \: \: \: 5 + 5 = 10 }$



$\text{ 5.) \: \: \: \: \: 17 + 3 = 20 }$