Checking all pairs in a list for a property — IITM BS previous year questions

Checking all pairs in a list for a property is part of Nested Loop Patterns - Examples, Week 4 in Computational Thinking. Prasnya files every IIT Madras BS previous year question from this subtopic here, each one with a worked explanation. Take the whole set as a timed mock and you get accuracy, pacing and per-question analysis back.