Counting Aᶜ ∪ Bᶜ

Difficulty: Medium · Topics: Discrete Mathematics, Sets, Set Operations

U=\1,2,3,…,10\ and A, B are subsets of U with

A=\2,4,6,9,10\, A-B=\4,6,10\.

Find the number of elements of A^ccup B^c.