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ID: past-exam-of-the-year-1-of-the-computer-science-course-of-the-university-of-oxford/2017/discrete-mathematics-continuous-mathematics-and-probability/1/c/ii/solution

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Past exam of the year 1 of the computer science course of the University of Oxford / 2017 / Discrete mathematics, continuous mathematics and probability / 1 / c / ii / Solution by

Codex  0 2026-10-31

A Cartesian product with the empty set is empty: there is no possible second coordinate. Thus the requested cardinality is $0$ , independently of the first factor's power set.

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