question_answer

  Let if possible  be rational  where p, q are integers having no common factor and q is a +ve integer.   L.H.S. is a positive integer, But R.H.S. cannot be a positive integer unless q = 1 [But An integer, not possible) we arrive at a contradiction. our supposition is wrong.    is not rational i.e.  is irrational. OR This pan is similar to question in the Sample Paper  is irrational.

Answer:

  Prove that  is irrational. OR Prove that  is irrational.