Sets - GRE Quantitative Reasoning

Card 0 of 4

Question

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

Answer

We know that all the numbers are positive, so they are greater than zero. We also know that the numbers are distinct, so they are all unique.

We can write this as {a + b + 8 + d + e}, so let a and b be 1 and 2 respectively, the smallest possible positive, distinct integers. Then let d and e be 9 and 10, the smallest positive, distinct integers larger than 8.

We add the set {1 + 2 + 8 + 9 + 10} to find it equals 30.

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Question

Which of these is a natural number?

Answer

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

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Question

Which of the following pairs of events are mutually exclusive?

Answer

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.

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Question

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

Answer

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

Only \dpi{100} \small -4.5 is one of the answer choices.

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