Data sufficiency is an important part of quantitative aptitude section of every competitive exam including IBPS, LIC, CAT, GMAT and other competitive exams. Data Sufficiency uses direct and indirect skills of the Mathematical concepts. Data sufficiency consists of a question followed by two statements. Candidates job is to decide whether the information provided in the statements (considering each alone or both combined) is sufficient to answer the question. The most interesting and peculiar thing about Data Sufficiency is that the answer choices are standardized they are the same for every single DS question.

**Data Sufficiency Aptitude basics, practice questions, answers and explanations **

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**Introduction: **This section consists of problems in which a question on any topic such as Coding-Decoding, Puzzle Test, Blood Relations, Mathematical calculations etc. is put forward followed by certain statements containing facts providing clues to solve the question.

I. Each Question given below has a problem and two statements numbered I and II giving certain information. You have to decide if the information given in the statements is sufficient for answering the problem. Indicate your answer as

(a) if the data in statement I alone are sufficient to answer the question;

(b) if the data in statement II alone are sufficient to answer the question;

(c) if the data either in I or II alone are sufficient to answer the question;

(d) if the data even in both the statements together are not sufficient to answer the question;

(e) if the data in both the statements together are needed;

**Example:**

1. What is Reena’s rank in the class?

I. There are 26 students in the class.

II. There are 9 students who have scored less than Reena.

Exp: Option (e).

From I and II, we conclude that there are 16 students above Reena in rank. Thus, Reena’s rank is 17th in the class. So, both the statements are necessary.

II. Each Question given below has a problem and three statements numbered I,II and III giving certain information. You have to decide if the information given in the statements is sufficient for answering the problem. Remember out of the three statements, each of them alone can also be sufficient to answer the question. In such cases for example, your answer should be taken as Only I or Only II or Only III and not Only I.

**Example:**

1. How many sons does X have?

I. Q and U are brothers of T.

II. R is sister of P and U.

III. R and T are daughters of X.

(a) I and II only.

(b) II and III together.

(c) I, II and III together.

(d) I, II and III together are not sufficient

(e) None of these

Exp: Option (d).

The information given in the three statements together is also not sufficient to answer the given question.

Data sufficiency is an important part of quantitative aptitude section of every competitive exam including IBPS, LIC, CAT, GMAT and other competitive exams. Data Sufficiency uses direct and indirect skills of the Mathematical concepts. Data sufficiency consists of a question followed by two statements. Candidates job is to decide whether the information provided in the statements (considering each alone or both combined) is sufficient to answer the question. The most interesting and peculiar thing about Data Sufficiency is that the answer choices are standardized they are the same for every single DS question.
A typical set of Instructions (4 options):
1. If one of the statements alone is sufficient
2. If both the statements alone are sufficient
3. If both statements together are sufficient but neither is sufficient alone
4. If both statements together are not sufficient
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