Checking independence from a joint PMF table or joint CDF — IITM BS previous year questions

Checking independence from a joint PMF table or joint CDF is part of Independence of Random Variables, Week 2 in Statistics 2. 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.