CSAT 2023

Q. Consider the following statements :
1. A is older than B.
2. C and D are of the same age.
3. E is the youngest.
4. F is younger than D.
5. F is older than A.

How many statements given above are required to the oldest determine person/persons?
(a) Only two
(b) Only three
(c) Only four
(d) All five
Correct Answer: (d) All five

Question from UPSC Prelims 2023 CSAT

Explanation : 

Oldest Person Determination A,B,C,D,E,F

To determine the oldest person, we need to consider all the statements.

From statement 1, we know A is older than B.

Statement 2 tells us that C and D are of the same age.

Statement 3 tells us that E is the youngest, so E cannot be the oldest.

Statement 4 tells us that F is younger than D, so D could potentially be the oldest.

However, statement 5 tells us that F is older than A, which means F is also older than B (since A is older than B).
Therefore, to determine the oldest person, we need all five statements.

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