Civil Services Prep

Prelims 2022 · CSAT / Logical Reasoning · Question 25

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?

  1. Statement-1 alone is sufficient to answer the Question
  2. Statement-2 alone is sufficient to answer the Question
  3. Both Statement-1 and Statement-2 are sufficient to answer the Question
  4. Both Statement-1 and Statement-2 are not sufficient to answer the Question

Answer

Both Statement-1 and Statement-2 are not sufficient to answer the Question

  • Statement-1: X is a brother of Y, and Y is a brother of Z. This only tells us X and Y are male; Z’s gender is unknown. So we cannot say whether Z is brother of X. Not sufficient.
  • Statement-2: X, Y and Z are siblings. This shows they share the same parents, but does not tell Z’s gender. So we cannot say whether Z is brother of X. Not sufficient.
  • Since each statement alone is insufficient, the correct answer is (d) Both Statement-1 and Statement-2 are not sufficient to answer the Question.
  1. X receives three coins of different denominations : 1, 2, 5, 10 and 20. If the total amount received by X is…
  2. For two distinct real numbers x and y, which of them is bigger? Statement I : x^2 Statement II : y
  3. If x and y are integers, then is x even? Statement I : x^2 y^2 is even. Statement II : 1 + x^2 + y^2 is odd.
  4. X is a collection of certain odd numbers whereas Y is a collection of certain even numbers. T consists of the…
  5. If x, y and z are integers, each greater than 1, then is x a prime number? Statement I : xy^2 = 116 Statement…
  6. Which of the following conclusions are valid? 1. Seven Sanskriti Angans, representing different regions of…