Full row rank, full column rank, and consequences for systems — IITM BS previous year questions

Full row rank, full column rank, and consequences for systems is part of Rank of a Matrix, Week 4 in Mathematics 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.