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Introduction - Data Sufficiency, Quantitative Aptitude | Quantitative Aptitude for Competitive Examinations - Banking Exams PDF Download
DATA SUFFICIENCY
Introduction:
This topic covers most of the topics of reasoning i.e. alphabetical series, coding and decoding, blood relation, direction, ranking etc.
In data sufficiency we don’t have to find the answer rather we have to analyze the given data and decide whether the given data is sufficient to find an answer or not.
There are two types of questions:
1. Two statement type
2. Three statement type
Type I: Based on two statements
In each of the questions below consists of a question and two statements numbered I and II given below it. You have to decide whether the data provided in the statements are sufficient to answer the question. Read both the statements and give answer-
(1) If statement I alone is sufficient but statement II alone is not sufficient.
(2) If statement II alone is sufficient but statement I alone is not sufficient.
(3) If each statement alone (either I or II) is sufficient.
(4) If statement I and II together are not sufficient.
(5) If both statement I and II together are sufficient, but neither statement alone is sufficient.
EXAMPLE 1:
Who scored highest among P, Q, R, S and T?
(I) Q scored more than S, but not as much as R.
(II) T scored more than R, but not more than P.
Answer: (5)
Explanation:
According to question-
(I) R>Q>S, (II) P>T>R
So, P>T>R>Q>S
P scored the highest.
So, both statements are needed to arrive at answer.
EXAMPLE 2:
Five friends P, Q, R, S and T are standing in a row facing east. Who is standing at extreme left end?
(I) R is between T and Q
(II) Only P is between S and T. R is immediately right of T.
Answer: (5)
Explanation:
According to question:
S is extreme left end.
So, both statements are needed to arrive at answer.
EXAMPLE 3:
Mahima's flat is on which floor of the five floor apartment?
(I) Her flat is exactly above Gita's flat whose flat is exactly above Nitin's first floor.
(II) Jayash's flat which is adjacent to Mahima's flat which is exactly above Ahmed’s flat who is on second floor.
Answer: (3)
Explanation:
(I) Mahima 3 floor, Gita 2 floor, Nitin - 1 floor
(II) Jayesh 4 floor, Mahima 3 floor, Ahmed 2 floor
So, any one statement is sufficient to give answer.
EXAMPLE 4:
Which code word stands for 'good' in the coded sentence 'sin co bye' which means 'He is good'?
(I) In the same code language, 'co mot det' means 'They are good'.
(II) In the same code language, 'sin mic bye' means 'He is honest'.
Answer: (3)
Explanation:
In the given statement and I, the common word is 'good' and the common code word is 'co'. So, 'co' is the code for 'good'.
In the given statement and II, the common words are 'He' and 'is' and the common code words are 'sin' and 'bye'. So 'sin' and 'bye' are the codes for 'He' and 'is'.
Thus, in the given statement, 'co' is the code for 'good'.
Type II: Based on three statements
In each of the following problems, there is one question and three statements I, II and III given below the question. You have to decide whether the data given in the statements is sufficient to answer the question. Read all the statements carefully and find which of the statements is/are sufficient to answer the given question. Choose the correct alternative in each question.
Example 1:
What is Suman's rank from the top in a class of forty students?
I. Suman is 3 ranks below Deepak from the top.
II. Deepak's rank from the bottom is 23.
III. Suman is 3 ranks above Deepak from the bottom.
(1) Any two of the three
(2) Only I and II
(3) Only II and III
(4) All I, II and III
(5) Only II and either I or III
Answer: (5)
Explanation:
From II, we conclude that in a class of 40, Deepak ranks 23rd from the bottom i.e. 18th from the top.
From I and II, we find that Suman is 3 ranks below 18th rank from the top i.e. she ranks 21st from the top.
From II and III, we find that Suman is 3 ranks above 23rd rank from the bottom
i.e. she ranks 20th from the bottom or 21st from the top.
Example 2:
Five persons - A, B, C, D and E are sitting in a row. Who is sitting in the middle?
I. B is between E and C.
II. B is to the right of E.
III. D is between A and E.
(1) Only I and II
(2) Only II and III
(3) Only I and III
(4) All I, II and III
(5) None of these
Answer: (4)
Explanation:
From I, the order is: E, B, C or C, B, E
From II, the order is: E, B
From III, the order is: A, D, E
Combining the above three, we get the order as: A, D, E, B, C
Clearly, E is sitting in the middle.
Example 3:
How is the girl in the photograph related to Kunal?
I. Pointing to the photograph, Kunal said, "She is the mother of my father's only granddaughter".
II. Kunal has no siblings.
III. Pointing to the photograph, Kunal said, "She is the only daughter-in-law of my mother."
(1) Any two of the three
(2) Only I and II
(3) Only II and III
(4) Either only III or only I and II
(5) None of these
Answer: (4)
Explanation:
From I, we conclude that the girl is either Kunal's or his brother's wife. But, according to II, Kunal has no siblings.
So, from both I and II, we conclude that the girl is Kunal's wife.
From III, we find that the girl is the only daughter-in-law of Kunal's mother. But, according to II, Kunal has no siblings. So, from both III and II, we conclude that the girl is Kunal's wife.
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FAQs on Introduction - Data Sufficiency, Quantitative Aptitude - Quantitative Aptitude for Competitive Examinations - Banking Exams
| 1. What is data sufficiency in the context of quantitative aptitude for banking exams? |  |
Data sufficiency is a type of question that assesses a candidate's ability to analyze and determine if the given data is sufficient to answer a specific question or solve a problem. In banking exams, data sufficiency questions are designed to test a candidate's logical reasoning and decision-making skills.
| 2. How many types of data sufficiency questions are commonly asked in banking exams? | |
There are typically two types of data sufficiency questions asked in banking exams: (1) Single statement data sufficiency, where candidates need to determine if the given data in a single statement is sufficient to answer the question, and (2) Double statement data sufficiency, where candidates need to analyze both statements together to determine if the data is sufficient.
| 3. What strategies can be used to solve data sufficiency questions effectively? | |
To solve data sufficiency questions effectively, candidates should follow these strategies:
- Read the question carefully and identify the specific information required.
- Evaluate each statement separately to determine if it alone is sufficient to answer the question.
- Analyze both statements together if necessary and determine if the combination of data is sufficient.
- Avoid making any assumptions or using any additional information beyond what is provided in the statements.
- Eliminate answer choices that are not supported by the given data.
- Practice solving a variety of data sufficiency questions to improve speed and accuracy.
| 4. Can we use our own knowledge or assumptions to solve data sufficiency questions? | |
No, it is important to only use the information provided in the statements to solve data sufficiency questions. Candidates should not rely on their own knowledge or make any assumptions beyond what is given in the statements. The purpose of these questions is to assess a candidate's ability to analyze and determine if the given data is sufficient, rather than testing their prior knowledge or assumptions.
| 5. Are data sufficiency questions time-consuming to solve? | |
Data sufficiency questions can be time-consuming if not approached strategically. However, with regular practice and familiarity with the question format, candidates can develop techniques to solve these questions efficiently. It is crucial to read the question carefully, evaluate the statements systematically, and eliminate irrelevant answer choices to save time during the exam.
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