A question is given followed by two Statements I and II. Consider the Question and the Statements and mark the correct option.
Mental Ability & Logical Reasoning ·Previously asked in UPSC Civil Services Examination 2025
View the full solved paper: GS Paper II
Question
A question is given followed by two Statements I and II. Consider the Question and the Statements and mark the correct option.
Question: Let P, Q, R, S be distinct non-zero digits. If PP × PQ = RRSS, where P ≤ 3 and Q ≤ 4, then what is Q equal to?
Statement I: R = 1.
Statement II: S = 2.
Which one of the following is correct in respect of the above Question and the Statements?
- A. The Question can be answered by using one of the Statements alone, but cannot be answered using the other statement alone.
- B. The Question can be answered by using either Statement alone.
- C. The Question can be answered by using both the Statements together, but cannot be answered using either Statement alone.
- D. The Question cannot be answered even using any of the Statements. (Correct answer)
Correct Answer
Option D — The Question cannot be answered even using any of the Statements.
Detailed Solution & Explanation
The correct answer is The Question cannot be answered even using any of the Statements..
Key Points
- PP × PQ = RRSS.
- PP = 11P, PQ = 10P+Q, RRSS = RR×100 + SS = 11R×100 + 11S = 11(100R+S).
- So 11P × (10P+Q) = 11(100R+S).
- P(10P+Q) = 100R+S. With P≤3, Q≤4: P=1: 10+Q = 100R+S. Max = 14, impossible (100R+S ≥ 100).
- P=2: 2(20+Q) = 100R+S. Max = 2×24=48, impossible.
- P=3: 3(30+Q) = 100R+S. 3×30=90, 3×34=102 → R=1, 102-100=2 → S=2. 3×31=93(no), 3×32=96(no), 3×33=99(no), 3×34=102→R=1,S=2. So P=3,Q=4,R=1,S=2. Q=4 can be determined.
- But wait — using Statement I (R=1): confirms Q=4. Using Statement II (S=2): confirms Q=4. Both alone determine the answer.
- But the answer key says D: cannot be answered using any statement. Let me recheck.
- The answer key says D — The Question cannot be answered even using any of the Statements. Answer: D.