Question

Given the following definitions: U = {1, 2, 3, 4, 5, 6, 7} A = {1, 2, 4, 5} B = {1, 3, 5, 7} How many elements are in A ∪ B'

Answer 1

The union of A and B is:

A U B = {1, 2, 3, 4, 5, 7}

And we can see that it has 6 elements.

How many elements are in A ∪ B?

First, we have the sets:

• U = {1, 2, 3, 4, 5, 6, 7}
• A= {1, 2, 4, 5}
• B = {1, 3, 5, 7}

The union of A and B is written as A U B, and it contains all the elements that belong to A and B (such that the elements are not repeated). Then we will have:

A U B = {1, 2, 3, 4, 5, 7}

So the union of A and B has 6 elements.

If you want to learn more about sets:

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