Each week, we post a new Challenge Problem for you to attempt. If you submit the correct answer, you will be entered into that week’s drawing for two free Manhattan Prep GRE Strategy Guides.

Of three possible events, event A is independent of each of the other two, and events B and C are mutually exclusive.  The probabilities that the individual events A, B, and C will occur are 0.2, 0.3, and 0.6, respectively.  What is the probability that none of the three events will occur?

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Here are the free GRE events we’re holding this week.

9/24/12 – Online – Monday’s With Jen – 7:00-8:30 PM

9/26/12 – Dallas, TX – Free Trial Class – 6:30-9:30 PM

Looking for more free events? Check out our Free Events Listings Page.

Each week, we post a new Challenge Problem for you to attempt. If you submit the correct answer, you will be entered into that week’s drawing for two free Manhattan Prep GRE Strategy Guides.

Two stores usually charge the same regular price for identical jars of peanut butter. This week, Store A is offering the jars of peanut butter for 10% less than regular price, and Store B is offering 6 jars of peanut butter for the regular price of 5.  If 6 jars of peanut butter cost a total of $1.18 less at Store B than at Store A this week, what is the regular price of a jar of peanut butter?

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Here are the free GRE events we’re holding this week.

9/17/12 – Chicago, IL – Free Trial Class – 6:30-9:30 PM

9/18/12 – Austin, TX – Free Trial Class – 6:30-9:30 PM

9/19/12 – Atlanta, GA – Free Trial Class – 6:30-9:30 PM

9/23/12 – New York, NY – Free Trial Class – 5:30-8:30 PM

Looking for more free events? Check out our Free Events Listings Page.

Each week, we post a new Challenge Problem for you to attempt. If you submit the correct answer, you will be entered into that week’s drawing for two free Manhattan Prep GRE Strategy Guides.

Of three possible events, events A and B are independent, and events B and C are mutually exclusive. The probabilities that the individual events A, B, and C will occur are 0.5, 0.3, and 0.2, respectively. What is the probability that both event A and event C will occur?

Read more

Here are the free GRE events we’re holding this week.

9/10/12 – Denver, CO – Free Trial Class – 6:30-9:30 PM

9/10/12 – Online – Free Trial Class – 8:00-11:00 PM

9/11/12 – Online – Mondays with Jen GRE Study Hall – 7:00-8:30 PM

9/10/12 – New York, NY – Free Trial Class – 6:30-9:30 PM

Looking for more free events? Check out our Free Events Listings Page.

Have you started studying Number Properties yet? Most people find this topic on the more difficult side in general, particularly the area of divisibility and prime. We did learn all of these basic concepts years ago, when we were about 8 or 10 years old “ number properties refers to all of the building blocks we use later in school to do algebra, geometry, and more advanced math.

However, most of what we learned in school was at a much more basic level (we were only 10 after all!) and we also didn’t have to understand the number properties theory or answer questions that were anything like some of the bizarre-seeming questions we find on standardized tests.

Let’s try this problem first (© Manhattan Prep) from our GRE Number Properties Strategy Guide. Set your timer for 2 minutes.

The quantity 3³4⁴5⁵6⁶ “ 3⁶4⁵5⁴6³ will end in how many zeros?

(A) 3

(B) 4

(C) 5

(D) 6

(E) 9

Got your answer? Great, let’s get started. You want to know what the correct answer is? Let me ask you a couple of questions first.

Are you confident about your answer? Did you end up having to guess? Did you give up without guessing? (If the last, make a guess right now. You can’t keep reading till you do. Well, obviously I can’t stop you, but I’m serious “ make a guess.)

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Here are the free GRE events we’re holding this week.

9/4/12 – New York City – Free Trial Class – 6:30-9:30 PM

9/5/12 – Berkeley, CA – Free Trial Class – 6:30-9:30 PM

9/5/12 – Washington, D.C. – Free Trial Class – 6:30-9:30 PM

9/9/12 – Boston – Free Trial Class – 5:30-8:30 PM

Looking for more free events? Check out our Free Events Listings Page.

Each week, we post a new Challenge Problem for you to attempt. If you submit the correct answer, you will be entered into that week’s drawing for two free Manhattan Prep GRE Strategy Guides.

At Medville Hospital, Drug X is prescribed only for Condition A and Condition B, which may occur simultaneously in the same patient. Last year, the department recorded the following statistics for prescriptions of Drug X.

Condition	Number of Cases (i.e. Number of patients with the condition)	% of cases in which Drug X was prescribed
A	4,000	25
B	2,000	80

Which of the following could be the number of Medville Hospital patients for whom Drug X was prescribed last year?

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Did you know that you can attend the first session of any of our online or in-person GRE courses absolutely free? We’re not kidding! Check out our upcoming courses here.

Did you know that you can find everything you ever wanted to know about Reading Comprehension here on our blog? Well, okay, perhaps I’m exaggerating just a little but not that much! Follow the links! Read more