Data Sufficiency

Data Sufficiency

  • This types of questions include resoning, logical and decision making skills.

    • Points to Rember

    For this, we must read the questions properly and based on the information given in the options we have to decide whether the information is sufficient to answer or not.

    The questions could vary from direciton distance relation to mathematical calculations surds indices and sometimes coding and decoding problems.

    Each data sufficiency element presents you with a question.

    Also, five answer choices will be there, containing the relationship between question and the data given in an indirect way.

    What all you need to do is to select the answer option that correctly defines this relationship.

Understanding the solution

  • To make the solution we have to follow some methods :

    • For solving data sufficiency questions you need to first understand the question and based on that, selection should be made.

    The questions will be asked with certain information with two statements labeled I and II.

    You need to analyze whether the information given in the label I and II is adequate to come to the solution or not.

    You should use all the data given in the statements along with your mathematics skill and well-known facts (such as sun rises in the east or the meaning of niece), the selection is to be made from below given options:


    The answer can be obtained from Statement I alone but statement II alone is not sufficient to answer the question asked


    A. Data in statement 1 is sufficient alone to determine the answer.

    B. Data in statement 2 is sufficient alone to determine the answer.

    C. Data in either of the statements is sufficient to determine the answer.

    D. Data provided in both the statements together are not sufficient to determine the answer.

    E. Data in both statements are required to determine the answer.

    Note : In data sufficiency problems, we can mark as “the data given in the statements is satisfactory” only when there is outcome or solution is in the numerical value.

Let's look at an Exmaple

    Who is the father of A.

    Statement I: x and y are brothers.

    Statement II: y’s wife is the sister of A’s wife.


    A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

    B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient..

    C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient..

    D. EACH statement ALONE is sufficient..

    E. Statements (1) and (2) TOGETHER are NOT sufficient..

    Ans : D

    Explanation : The statement I gives the relation between X and Y. So statement I alone cannot determine the answer. Through statement II we can determine that Y is the brother-in-law of A. Thus using both the statements you cannot determine the father of A. hence option D is correct.