You Can Retake GMAT Online

This is straight from GMAC:

"Option to Take the GMAT™ Online Exam Again Since you took your GMAT™ Online exam before the use of physical whiteboards was permitted, we are offering you the option to take the GMAT™ Online exam again. If you would like to take the test again using a physical whiteboard, you can now schedule an additional GMAT™ Online exam appointment between June 11th through July 17th. Please note that the $200 registration fee applies for this option."

Good news for the early adopters who took GMAT online with the online whiteboard: you can retake the online GMAT with a physical whiteboard. This is fantastic for those who had a crappy first test or who didn't get enough practice to make the online whiteboard an asset.

I have a GMAT planned for June 8th can I schedule a second one after June 11th?

YES! Even if you haven't yet taken GMAT online you can still take advantage of the retake option. You just need to book a test for June 10th or before. Then you'll also be able to book a test for June 11th and beyond. If you're somewhat ready to start testing I'd go for the two. It's a rare opportunity to:

  1. Take the GMAT in the comfort of your living room
  2. Take two GMATs that will not count toward your yearly or lifetime limits

There's also the bonus that there's no waiting period between online tests or online tests and in person tests. So you can take an online GMAT on June 10th, June 11th, and then and in person on June 12th. Not that you'd want to do things that way but the zero day waiting period does add flexibility to planning.

 

Maligned GMAT Whiteboard Reinforced with Physical Option

Most GMAT hopefuls were deeply disappointed with the GMAT online whiteboard. Even if it could be used as effectively as a physical whiteboard it still required extra work to learn. And, let’s face it, studying for the GMAT requires an olympic effort. Having to adopt a new GMAT tool, regardless of whether it might boost your GMAT problem solving skills, wasn’t welcome news.

Starting June 11th: A physical whiteboard will be allowed on the online GMAT. 

Why now? Did the GMAT online early birds get screwed?

I’m not shocked by the update but I am surprised. If a physical whiteboard is OK then why wasn't it offered at the start? Now the GMAT online late adopters have a potential advantage over the GMAT at home early birds. 

Did the early birds get screwed? Yes and no. Again, with some practice the online whiteboard can equal the physical one and even promotes healthy GMAT habits. But, hard to argue that having the option of either physical or online isn’t a good thing.

GMAT Online Until July 17th but… 

More positive news: we’ve got GMAT Online as an option until July 17th. Keep in mind though that the lifetime GMAT online limit remains at: 1. So if you’ve already taken a stab at it that’s it. For now. And probably forever. Test centers are reopening. Slowly and not transparently. But reopening. And, likely, come July 17th GMAT online will drift into history. We think.

No Excuse, Take the GMAT Online

If you’re ready to launch: take the GMAT online! It’s a fantastic option that’s potentially less stressful because you can take it in the comfort of your living room. Yes, it’s possible you’ll have tech issues and some of our students have reported proctors simply not showing up BUT more likely than not you’ll sail through it. And, if it all goes sideways, yes you will waste a bit of time and the customer service can be slow, but GMAC has been pretty good about allowing retakes due to technical issues. 

Hope this makes your day a little lighter. Comment with any questions and good luck on your GMAT!

GMAT Official Practice Questions 2 (out May 21st)

GMAC's been on a role releasing official GMAT questions.

Have GMAT? Will travel!

GMAT Tourism: In search of in person GMATs

If n is a positive integer and n^2 is divisible by 72, then the largest positive integer that must divide n is GMAT Explanation, Video Solution, and More Practice!

If n is a positive integer and n^2 is divisible by 72, then the largest positive integer that must divide n is

A. 6
B. 12
C. 24
D. 36
E. 48

We get this one a lot in GMAT tutoring sessions. Most people fail to understand what the questions is asking and then just start working without a plan. It ends up being that work itself isn't totally off but the student doesn't really know where to take it in order to narrow down the answer choices.

What also tends to confuse is that the question asks for the largest positive integer but we end up choosing the smallest possible value of n.

Define the question

the largest positive integer that must divide n

There it is. But let's not leave it like that. Always try to do something with the questions. In this case because we're looking for something that divides evenly into n let's set up a fraction:

n/z = integer

And we want to maximize z because we're looking for the largest integer that must divide n.

The largest integer that divides any integer is itself. So really we're looking for n. Not that important to make that inference but just wanted to point it out.

Setup

Now let's gather the information from the question and get things set up so we can make some inferences. We know that n is a positive integer and then n squared is divisible by 72. We can write out an equation with that second piece of information.

n^2/72 = integer

We're really looking to solve for n so let's go ahead and simplify this equation.

n^2 = integer*72

Take the square root of both sides.

n = √72√integer

Now let's pull out perfect squares from 72.

n = √9√4√2√integer

n = 6√2√integer

Now we can use the first piece of information that n is a positive integer. So 6√2√integer is a positive integer. Somehow the radicals have to disappear. So √2•√integer must be an integer. What's an easy way to do that? Make integer equal 2 so you have √2•√2 = 2.

n = 6*2 = 12

What's the largest positive integer that must divide n? 12

Now, you might be thinking: is 12 the only possibility for n? Or put another way, is 2 the only possible value for the integer? Good question. No. There are an infinite number of possible values for the integer and consequently for n. Any number that cancels out the radicals will work.

√2√8 = √2√2√4 = 4*6 = 24

√2√18 = √2√2√9 = 6*6 = 36

√2√32 = √2√2√16 = 8*6 = 48

Any number that has √2•perfect square will work.

So why is the integer 2 and the correct n 12? This is coming back to what tends to confuse GMAT tutoring students (looking for the largest integer that must divide but then the answer is actually the smallest possible value of n).

Because the question is a MUST. So you need the most basic building block of n. Look at all of the values we came up with for n: 12, 24, 36, 48. What's the biggest integer they have in common (least common multiple)? 12

Regardless of which multiple of n you come up with it will always be divisible by 12.

Correct Answer: B

Video Solution: If n is a positive integer and n^2 is divisible by 72, then the largest positive integer that must divide n is

 

 

Additional GMAT Divisibility Practice Question

Here's another divisibility question from GMAT Official Guide: If x and y are positive integers such that y is a multiple of 5 and 3x + 4y = 200, then x must be a multiple of which of the following?

Here's a tricky exponents divisibility puzzle from GMAT question of the day

Mini exponents/factoring/divisibility puzzle from question of the day

And another from the GMAT official guide that's not the same but has a similar puzzle/exponents/divisibility vibe with factorials in the mix: If p is the product of the integers from 1 to 30, inclusive, what is the greatest integer k for which 3^k is a factor of p?

 

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