CSC 209 Mathematical Foundation of Computer science Exam 2020

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CSC 209: Examination, 22 February 2020 (70 marks, Section A + Section B), University of Buea, Faculty of Science, Dept of Computer Science: registration/permutation/committee counting, an $\binom{n}{r}$ symmetry identity, a binomial term, $\mathbb{Z}_n$ operations (flagged undefined $2\div3$ in $\mathbb{Z}_6$ since $\gcd(3,6)\nmid2$), a 3-circle Venn diagram ($A-(B-C)=(A\setminus B)\cup(A\cap C)$, built via a fill/erase/refill tikz technique after an even-odd-rule clipping error), function-composition-associativity verification, injective/surjective composition proofs, a relation matrix/directed-graph diagram, and a Diophantine equation via the Euclidean algorithm.