Q. Three Statements S1, S2 and S3 are given below followed by a Question:
S1: C is younger than D, but older than A and B.
S2: D is the oldest.
S3: A is older than B.
Question: Who among A, B, C and D is the youngest?
Which one of the following is correct in respect of the above Statements and the Question?
(a) S1 alone is sufficient to answer the Question.
(b) S1 and S2 together are sufficient to answer the Question.
(c) S2 and S3 together are sufficient to answer the Question.
(d) S1 and S3 together are sufficient to answer the Question.
Correct Answer: (d) S1 and S3 together are sufficient to answer the Question.
Question from UPSC Prelims 2020 CSAT Paper
Explanation :
C is younger than D
From statement S1 we know that C is younger than D but older than A and B. So the order of their ages is: D > C > A and B.
From statement S3 we know that A is older than B. Combining this information with statement S1, we get the order of their ages as: D > C > A > B.
So from statements S1 and S3 together, we can conclude that B is the youngest among A, B, C and D
