Question

write four pairs of prime numbers whose sum is divided by 5
correct answer do
urgent h​

Answer 1

Prime numbers less than 20 are 2, 3, 5, 7, 11, 13, 17 and 19.

(i) 2+3=5 (divisible by 5)

(ii) 2+13= 15 (divisible by 5)

(iii) 3+7=10 (divisible by 5)

(iv) 3+17= 20 (divisible by 5)

(v) 7+13=20 (divisible by 5)

Answer 2

We know,

• Numbers divisible by 5 are 5, 10, 15, ... (Multiples of 5).

Now,

• We can express the numbers as a sum of two prime numbers lesser than 20.

Prime numbers les than 20 are: 2, 3, 5, 7, 11, 13, 17, 19

• 5 = 2 + 3

• 10 = 3 + 7

• 15 = 2 + 13

• 20 = 3 + 17

• 20 = 7 + 13

Therefore the pairs are :

$\boxed{\bold{\sf{(2,3), (3,7), (2,13), (5,5), (3,17), (7,13)}}}$