Which of the following shows the union of the sets? {7, 8, 9, 10} {9, 10, 11, 12}

{ 7,8,9,10,11,12}

Step-by-step explanation:

The union means joining of the two sets

 {7, 8, 9, 10}U {9, 10, 11, 12}

= { 7,8,9,10,11,12}

{7, 8, 9, 10, 11, 12}

Step-by-step explanation:

Union of the sets is the combination of the elements.

{7, 8, 9, 10} ∪ {9, 10, 11, 12}

{7, 8, 9, 10, 11, 12}

the answer is 8/21

hope this