Data sufficiency

Introduction
    Data sufficiency has recently become a favorite question for many of the recent examinations. In this type of questions, usually a question is given followed by two or three statements. These two or three statements contain data or some pieces of information using which the question can possibly be solved. You are required to judge whether the data given is sufficient to answer the question or not.
fORMAT OF sTUDY


    Data sufficiency questions are not new topics in themselves. They may be covering any of the topics already covered; for example: percentage, time and work, algebra, time and distance profit and loss, S.I., C.I. average etc. Hence you should treat these questions as old-type only. Only these questions are asked in a different pattern and not the conventional pattern.
Helping Hands
    When you are attempting a question of data sufficiency you should follow a systematic approach as laid down below. This approach being a systematic one, will save your time. Also in case you are stuck up at any point, it will help your chances of guessing a correct answer because it narrows down the possible answers from 5 to 3 or 2.
    To understand this approach let us first look at the way in which such questions are usually asked: (1) Two statements D.S. (2) Three statements D.S.