Given below are six sentences, four of which (P,Q,R,S) are jumbled. Pick the option that gives the correct order of P,Q,R,S. S-1 If you are doing a piece of writing, you need to refer to some books for information on the subject. P - For this, you need to know how the books are classified and arranged in the library. Q- This necessitates your using a library and locating the book you need. R - The catalogue in the library is most often available in form of cards S - This becomes easy and saves time if you understand how the catalouging system in the library S-6 The cards are arranged in alphabetical order. Correct Answer QPSR The correct answer is Option 4) i.e. QPSR While arranging the parts of the sentence given in options, we have to find some grammatical or contextual connections between them, so let’s find out. S-1 and S-6 are fixed, S1 establishes the subject of the paragraph, S1 must be followed by 'P' as it is in continuation with our first statement, to do a piece of writing one has to refer to some books and this necessity can only be fulfilled by the library. Hence, we can say that the sentence will start with 'Q' and will be followed by 'P' as "locating the book' is connected with 'P' because it specifies for locating the book you need to know how the books are classified and arranged in the library. Now, S will come after R as it the only valid combination and completes the sentence. Thus, the correct order is QPSR.