Data sufficiency is an important chapter of Quantitative Aptitude section. In almost every competitive exam there are at least 3-4 questions from this chapter.
In Data sufficiency questions, examiner asks you a question and provide you 2-3 statements. You need to tell that wthere the question can be answered by using the statements. One of the biggest mistake that candidates commit is, they try to solve the question whereas it is not required.
In the below video I tried to explain this concept in easiest way.
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