The numbers 1, 5 and 25 can be three terms (not necessarily consecutive) of

The sum of (p + q) th and (p $$-$$ q)th terms of an AP is equal to

What is the fourth term of an AP of n terms whos sum is n(n + 1)?

If $p ^ x = q ^ y = r ^ z$ where x, y and z are in GP, then consider the following statements:

I. p, q and rare in AP.

II. In p, In q and Inrare in GP.

Which of the statements given above is/are correct?