PSAT Math : Counting / Sets

Study concepts, example questions & explanations for PSAT Math

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Example Questions

Example Question #1 : How To Find The Missing Number In A Set

Find the missing number in the following set:

Possible Answers:

Correct answer:

Explanation:

The rule is as follows: add 2 to the previous number then multiply times 2.

The answer is (16 + 2) * 2 = 36.

Example Question #141 : Integers

 

If the average of Set  is , what is the average of Set ?

Possible Answers:

Correct answer:

Explanation:

We know the average of Set A is 5. Therefore:

Now let's solve for :

We can now plug this value of  into Set B and solve for the average:

Set B = {0, 2, 4}

The average of Set B is 2.

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