Combinatorics, or at least part of it, is the art of counting. For example: how many derangements does a set with n n elements have? A derangement is a bijection with no fixed points. We’ll count them ...

By Times’ Junior Journalist Kaesar Wu Publicly released in May, 2015, Discord began as a tool for gamers to communicate.

The Uttarakhand Board of School Education decides the syllabus for the Uttarakhand Teacher Eligibility Test (UTET). The UTET ...