# GRE Math : How to find the missing number in a set

## Example Questions

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

The product of two integers is 14. Which of the following could be the average of the two numbers?

Explanation:

The two integers in this case, and their respective averages, could be:

Only  is one of the answer choices.

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

Which of these is a natural number?

None of these are natural numbers .

All of these are natural numbers.

Explanation:

The natural numbers are the positive integers (whole numbers) starting with 1.

### Example Question #2 : How To Find The Missing Number In A Set

Which of the following pairs of events are mutually exclusive?

the positive numbers, the numbers less than

the even numbers, the numbers greater than

the negative numbers,

the numbers less than , the numbers greater than

for all  values, the numbers greater than

the positive numbers, the numbers less than

Explanation:

We can think of mutually exclusive in terms of a Venn diagram.  We are looking for the pair of events that has nothing in common.  The only sets that don't have a single number in common are the positive numbers and the numbers less than –200.

### Example Question #4 : How To Find The Missing Number In A Set

In the set of positive, distinct integers , the median is . What is the minimum value of ?