The document provides a collection of 50 important formulae for the quantitative ability section of the CAT exam. It covers topics such as averages, percentages, profit and loss, discounts, ratios, proportions, algebra, trigonometry, geometry, and calculus. The formulae are presented along with brief explanations and examples. Additionally, the document advertises an online CAT preparation course that provides personalized study material, mock exams, and analysis to help students improve their skills.