57. The sum of 2 positive prime numbers is a prime number, and 3 times that sum is an odd number. Which of the following prime numbers must be one of the original prime numbers ?

Answer and Explanation

Your Answer is

Correct Answer is A

Explanation

Because a prime number must be an odd number except 2, and if an odd number is the sum of two numbers, then one of the two numbers is odd and the other is even, then there must be a prime number of 2, so choose A