Converting between P and C: P(n,r) = r! × C(n,r) — IITM BS previous year questions

Converting between P and C: P(n,r) = r! × C(n,r) is part of Permutations vs Combinations - When Order Matters (L6.2), Week 6 in Statistics 1. 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.