Q. Consider the Question and two Statements given below:
Question: Is Z brother of X?
Statement-1 : X is a brother of Y and y is a brother of Z.
Statement-2 -: X, Y and Z are siblings.
Which one of the following is correct in respect of the Question and the Statements?
a. Statemcnt-1 alone is sufficient to answer the Question
b. Statement-2 alone is sufficient to answer the Question
c. Both Statement-1 and Statement-2 are sufficient to answer the Question
d. Both Statement-1 and Statement-2 are not sufficient to answer the Question
Correct Answer: d. Both Statement-1 and Statement-2 are not sufficient to answer the Question
Question from UPSC Prelims 2022 CSAT Paper
Explanation :
Is Z brother of X?
Statement 1:
X is the brother of Y, and Y is the brother of Z.
But we do not know whether Z is a male or a female. So, we cannot say whether Z is the brother or sister of X.
Statement 2:
X, Y, and Z are siblings. It tells us nothing much. Here, also gender of Z is not known. So, Z can be either brother or sister of X.
Even if we combine the two statements, we cannot answer the given questions.
