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Two prime numbers A, B

If A and B are twin primes with B>23, then which of the following numbers would always divide A+B?

  • A.12
  • B.8
  • C.24
  • D.None of these

Answer: A

Any prime number greater than 3 will be in the form of 6x+1 or 6x−1.

Thus, both prime number are twins:

Let first be 6x−1
and 2nd be 6x+1
Sum=12x

Thus it is always divisible by 12.

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