Question

Write three pairs of prime numbers less than 20 whose sum is divisible by 5?

• A. $(2,3),(0,5),(13,17)$
• B. $(2,3),(3,7),(13,17)$
• C. $(2,3),(3,7),(2,8)$
• D. $(2,3),(2,17),(13,17)$

Answer 1

The correct option is B $(2,3),(3,7),(13,17)$

Solve by options

(A) $(2,3),(0,5),(13,17)$

$2,3$ is prime number but $0$ is not a prime number

(B) $(2,3),(3,7),(13,17)$

$2,3,7,13,17$ all are prime numbers and less than $20$

and $2+3=5$ divisible by $5$

$3+7=10$ divisible by $5$

$13+17=30$ divisible by $5$

So, option B is correct.