Question

If $X=49,51,53,55,....$ and $Y=45,47,49,51$ are subsets of a universal set $U$, which of the following could describe $U$?

• A. $\text{U}=\{45,47,49,51,53,55,........\}$
• B. $\text{U}=\{45,47,49,51,53,55\}$
• C. $\text{U}=\{45,49,55\}$
• D. None of these

Answer 1

The correct option is A $\text{U}=\{45,47,49,51,53,55,........\}$

A universal set is a set that contains all the elements or objects of other sets, including its elements, So
$\text{U}=\{45,47,49,51,53,55,........\}$ is a universal set.