Hi Guys,

I always use face the problem with DS questions in CAT so to help you guys this tutorial for you.. let me know how much did it helped.

DS questions are about working out what is necessary and sufficient data to be able to answer a question which is very different from the usual problems solving questions you have faced.

Once you are familiar with the format then this will make complete sense.

In this tutorial we will look at the key strategies for tackling data sufficiency questions and work through some examples of standard ‘tricks’ that are used to catch you out in this type of question.

# What is a data sufficiency question

Each data sufficiency question consists of 3 parts

- The question
- Statement (1)
- Statement (2)

You are asked to determine which combination of the two statements is necessary and sufficient to answer the question.

Answers A-E answers for data sufficiency problems are always the same.

- Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient
- Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient
- BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient
- EACH statement ALONE is sufficient
- Statements (1) and (2) TOGETHER are NOT sufficient

Data sufficiency questions are unlike most of the math questions in that you don’t have to answer the question in the first part of the problem, rather you have to work out what information is sufficient to solve the question.

This is probably easiest to see if we look at an example.

This is an example of a data sufficiency problem.

Is x>0?

- x2>0
- x3>0

- Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient
- Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient
- BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient
- EACH statement ALONE is sufficient
- Statements (1) and (2) TOGETHER are NOT sufficient

Remember, each data sufficiency problem is made up of the question,

Is x>0?

And two statements,

- x2>0
- x3>0

You are asked to decide which combination of the statements is is required to answer the question.

Now lets work through this example of a data sufficiency problem together.

For rest go to CAT India Online’s CATclub

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