Progressions and Series is one of the three important topics in the quantitative section in CAT and a significant number of questions appear in the examination from this section every year. Some of the questions from this section can be very tough and time consuming while the others can be very easy. The trick to ace this section is to quickly figure out whether a question is solvable or not and not waste time on very difficult questions. Some of the questions in this section can be answered by ruling out wrong choices among the options available. This method will both save time and improve accuracy. There are many shortcuts which will be of vital importance in answering this section. We will try and upload a few to help students.
Sum of the first n terms: