Civil Services Examination · प्रश्न 74
A question is given followed by two Statements I and II. Consider the Question and the Statements and mark the correct option. Question: Is (p + q)² - 4pq, where p, q are natural numbers, positive? Statement I: p < q. Statement II: p > q. Which one of the following is correct in respect of the above Question and the Statements?
उत्तर देखें और व्याख्या
उत्तर: (B) The Question can be answered by using either Statement alone.
व्याख्या
(p + q)² - 4pq = (p - q)², which is positive whenever p ≠ q; either statement gives p ≠ q. (Answer as per the official UPSC answer key.)