UPSC Prelims 2026·CSAT·other·basic numeracy

Directions for the next 5 (five) items : Each item in this section contains a question followed by two statements. Answer each item using the following instructions and mark your response on the Answer Sheet accordingly. Question : For two distinct real numbers x and y, which of them is bigger? Statement I : x² < y < 1 Statement II : y < √x < 1

Dalvoy logo
Reviewed by Dalvoy
UPSC Civil Services preparation
Last updated 25 May 2026, 8:23 pm IST
  1. ASelect this option if the question can be answered using one of these statements alone, but cannot be answered using other statement
  2. BSelect this option if the question can be answered using either statement alone
  3. CSelect this option if the question can be answered using both the statements together, but cannot be answered using either statement alone
  4. DSelect this option if the question cannot be answered even using any of the statementsCorrect

Explanation

Based on the foundational axioms of real analysis (formalized by mathematicians like Richard Dedekind in the late 19th century), solving algebraic inequalities requires evaluating all possible constraints to establish a definitive, unambiguous relationship.

To determine whether x > y or y > x, we evaluate the statements using test values for real numbers.

Statement I: x² y. However, y could also be 0.8, which means y > x. Because it yields multiple contradictory relationships, Statement I alone is insufficient.

Statement II: y y) or y could be 0.4 (y > x). Thus, Statement II alone is also insufficient.

Combining Both Statements: x² y) or y = 0.4 (resulting in y > x). Because a unique mathematical relationship cannot be established even when combining all data, Option D is the correct answer.

  • Option A is incorrect because Statement I allows for scenarios where x is larger or smaller than y.
  • Option B is incorrect because neither statement independently provides a unique solution.
  • Option C is incorrect because synthesizing both statements still leaves an open interval around x, failing to restrict y to just one side of x.

Takeaway: For proper fractions/decimals between 0 and 1, higher powers yield smaller values (x² x). When a variable is bounded by a number's square and root, always test values both above and below the base number itself.

other: Directions for the next 5 (five) items : Each item in this section contains a question followed by two statements. Answe

Related questions

More UPSC Prelims practice from the same subject and topic.