GRE Subject Test: Math : Union & Intersect

Study concepts, example questions & explanations for GRE Subject Test: Math

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Example Questions

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Example Question #11 : Real Analysis

Evaluate 

Possible Answers:

Correct answer:

Explanation:

First, do both of the parentheses. Do the intersection of sets A and C, which means to include elements in common to both.

Then do the union of sets B and D, which means to include all the elements in both sets without including duplicates.

Finally, do the intersection of your answers from the two parentheses including the elements common to both.

Example Question #11 : Real Analysis

What is the intersection of:

 and ?

Possible Answers:

Correct answer:

Explanation:

Step 1: Recall what is the definition of the intersection of two sets.

The intersection of any two sets is defined as another set that contains only the shared elements between the two sets.

Step 2: Find the elements that are shared...

The elements that are shared are: .

Step 3: Write the answer in the correct form:

Example Question #11 : Real Analysis

What is ?

Possible Answers:

Correct answer:

Explanation:

 means the union of set B and set C. Union means to include all the numbers that are in either set B or set C (without listing duplicates twice). The numbers 1, 3, 5, 8, 9, and 11 appear in B and the numbers 2, 3, 5, 6, 9, 12 appear in C. Including all of those numbers in the set symbol gives the correct answer.

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