Algebra-1

To find the universal set U, we need to first determine the union of sets A and B, and then identify the elements of U by combining A∪B and its complement.

Given:

A = {x∣x is a positive odd number less than 10}, this means A = {1, 3, 5, 7, 9}

B = {1, 2, 3}

First, find the union of sets A and B:

A∪B = {1, 3, 5, 7, 9} ∪ {1, 2, 3}

A∪B = {...