IIT JEE Advanced 2010 Paper 2

Paragraph Type
This section contains 2 paragraphs. Based on each of the paragraphs 3 multiple choice questions have to be answered. Each of these questions has 4 choices (A), (B), (C) and (D) out of which ONLY ONEis correct.
Paragraph for Questions 50–52:
Consider the polynomial f (x) = 1+2x+3x2+4x3. Let s be the sum of all distinct real roots of f (x) and let t = s .