Summing a list recursively - head + sum(tail) — IITM BS previous year questions

Summing a list recursively - head + sum(tail) is part of Recursion - Classic Examples, Week 9 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.