Question

The union of sets P = {5, 6, 7, 8, 9} Q = {1, 2, 3, 4, 5} is given by which of the following? {1, 2, 3, 4, 5, 6, 7, 8, 9} {1, 2, 3, 4, 5, 5, 6, 7, 8, 9} ø {5}

Answer 1

Answer: First option.

Explanation:

Given two sets A and B, the union (A∪B) will be the set of elements which belong to either A or to B or to both.

Inf this case you have these two sets:

`P=`{
`5, 6, 7, 8, 9`} and
`Q=`{
`1, 2, 3, 4, 5`}

To find the union of these sets, put together the elements of the set P and the elements of the set Q (you need to remember that no element must be repeated).

Then, you get that the union of sets P and Q is:

`P`∪
`Q=`{
`1, 2, 3, 4, 5,6, 7, 8, 9`}

This matches with the first option.