Classification of numbers (real, rational, integer, prime, co-prime) — CAT previous year questions

Classification of numbers (real, rational, integer, prime, co-prime) is part of Basics & Divisibility, Number System in Quantitative Aptitude. Prasnya files every CAT previous year question from this concept here, each one with a worked explanation. Take the whole set as a timed CAT mock and you get accuracy, pacing and per-question analysis back.