Maths Olympiad Prep

Track / Stage 4 / 40 of 340 #300 of 1964

Problem 300

AMC 12 late, AIME early
Combinatorics Difficulty 4.6 Find the answer

Given the universal set I={1,2,3,4,5},ABI=\{1,2,3,4,5\}, A \cap B ={2},AˉB={1,4}=\{2\}, \bar{A} \cap B=\{1,4\}. Then Bˉ\bar{B} equals: ( ).
(A) {3}\{3\}
(B) {5}\{5\}
(C) {1,2,4}\{1,2,4\}
(D) {3,5}\{3,5\}

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Official solution

1. D

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Source: NuminaMath-1.5, licensed Apache-2.0. Statement reproduced verbatim; metadata (topic, difficulty, ordering) added by this project.