Cookie_2046
  • Cookie_2046
What is the union of the two sets A={1,5,8,12,17} and B= {5,17}? A. {1,5,17} B. {1,5,8,12,17} C. {5,14} D. {17}
Mathematics
katieb
  • katieb
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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anonymous
  • anonymous
Do you know what union means?
mathstudent55
  • mathstudent55
The union of two sets is a set that contains every element that is in one set or in the other set. Write each element only once. Now look at your sets. Create a new set, and start filling it with every element you see in set A or in set B. Do not write an element more than once.
Cookie_2046
  • Cookie_2046
d?

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mathstudent55
  • mathstudent55
|dw:1440194889262:dw|
mathstudent55
  • mathstudent55
The union has all elements from BOTH sets. You did the intersection. The intersection has the elements that are in common. The union has all of them.
mathstudent55
  • mathstudent55
The figure above shows how you start writing the union of the sets. Start by creating a new set and copying all elements from one of the sets. The union already has all elements of set A.
mathstudent55
  • mathstudent55
Now look at the elements of set B. If they are different, write them in the union also. If they are already int he union, don't write them again.
mathstudent55
  • mathstudent55
|dw:1440195123845:dw|
mathstudent55
  • mathstudent55
The two elements of set B are already in the new union set we started writing, so the union set is done. We can close the bracket and we have finished.
mathstudent55
  • mathstudent55
|dw:1440195191470:dw|
Cookie_2046
  • Cookie_2046
so is b the answer?
mathstudent55
  • mathstudent55
Exactly.
Cookie_2046
  • Cookie_2046
Oh Okay thanks for the big help
mathstudent55
  • mathstudent55
Since both elements of set B are also elements of set A, set B does not add any new elements to the union of the sets.
mathstudent55
  • mathstudent55
You're welcome.

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