Multiple choice

Which of the following cannot be written as the sum of two prime numbers?

  1. 16

  2. 21

  3. 23

  4. 24

  5. 30
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Is the correct option. 23 = 2 + 21...............(21 is not prime) = 3 + 20..............(20 is not prime) = 5 + 18..............(18 is not prime) = 7 + 16..............(16 is not prime) = 11 + 12............(12 is not prime) = 13 + 10............(10 is not prime) = 17 + 6..............(6 is not prime) = 19 + 4..............(4 is not prime). So, option (3) is correct.

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