Which of these is a conjecture?

  1. The angles of a triangle add up to 180^circ.
  2. There are infinitely many prime numbers.
  3. There are infinitely many prime numbers p such that p + 2 is also prime.
  4. a^2 + b^2 = c^2 in a right triangle.
Answer

C) There are infinitely many prime numbers p such that p + 2 is also prime.

The last option was proved by Euclid; the twin-prime statement has never been proved. SLO M-09-B-14 · Knowledge

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