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Type: Posts; User: Brent Hanneson; Keyword(s):

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1. ## Thread: An “Armstrong number”

by Brent Hanneson
Replies
2
Views
2,490

### Re: An “Armstrong number”

1,6k4 is a 4-digit number.
So, 1^4 + 6^4 + k^4 + 4^4 = 16k4
Evaluate: 1 + 1296 + k^4 + 256 = 16k4
Simplify: 1553 + k^4 = 16k4

Whatever k is, it must be the case that the UNITS digit of k^4 is...
2. ## Thread: In performing a sequence of experiments

by Brent Hanneson
Replies
1
Views
1,440

### Re: In performing a sequence of experiments

A quick solution is to say that the original 20 measurements were all 34
That is {34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34}
These values definitely have an...

by Brent Hanneson
Replies
1
Views
1,060

### Re: Geometry

There's no math required for this question.
The strip can be any value, since we could choose a certain width for the strip and then just shrink or expand the inlay until the ratio of (inlay area):...
4. ## Thread: Manhattan 5lb divisibility and primes

by Brent Hanneson
Replies
3
Views
1,925

### Re: Manhattan 5lb divisibility and primes

Another way to state this question is: What is the greatest common factor of 4000 and 180?

by Brent Hanneson
Replies
2
Views
2,046

### Re: Logical Reasoning

G = 10^100
We can rewrite this as follows: G = (10^3)(10^97)
Or we can say G = (1000)(10^97)

So, G/8 = (1000)(10^97)/8 = (125)(10^97)
G/5 = (1000)(10^97)/5 = (200)(10^97)
G/4 =...
6. ## Thread: Best GRE study guide? I really liked my math lab with how to and then sample problems

by Brent Hanneson
Replies
1
Views
1,109

### Re: Best GRE study guide? I really liked my math lab with how to and then sample prob

We have an online study guide here - Study Guide - Overview | Greenlight Test Prep Online Course
It can be used in conjunction with our free GRE video course.

Cheers,
Brent
7. ## Thread: Help me with this probablity problem

by Brent Hanneson
Replies
4
Views
2,834

### Re: Help me with this probablity problem

You will notice that I never said that 12 people can be seated at a round table in 11! ways (Chromepal made this claim). I'm not a big fan of "people sitting at a circle" questions, because the...
8. ## Thread: Help with a little arithmetic problem

by Brent Hanneson
Replies
3
Views
2,084

### Re: Help with a little arithmetic problem

When it comes to remainders, we have a nice rule that says:

If N divided by D, leaves remainder R, then the possible values of N are R, R+D, R+2D, R+3D,. . . etc.
For example, if k divided...
9. ## Thread: 175 Interactive Flashcards for GRE Math

by Brent Hanneson
Replies
0
Views
988

### 175 Interactive Flashcards for GRE Math

175 flashcards covering every formula, concept and strategy needed for the quantitative sections of the GRE. Each flashcard is linked to a corresponding video lesson from Greenlight Test Prep’s free...
10. ## Thread: GRE preparation: is MAGOOSH BEST??

by Brent Hanneson
Replies
14
Views
11,466

### Re: GRE preparation: is MAGOOSH BEST??

If you're still looking for GRE resources, we have a free course with 500+ videos, 600+ practice questions and 5 full-length practice tests.

Cheers,
Brent - Greenlight Test Prep

by Brent Hanneson
Replies
7
Views
3,841

### Re: Problem

You're absolutely correct - nice catch!

I have reposted my answer above.

Cheers,
Brent

by Brent Hanneson
Replies
7
Views
3,841

### Re: Problem

Let's examine the two EXTREME values of a.

Case a: The GREATEST value of a
If the values are strictly increasing (i.e., no values are equal), them a could be a little bit smaller than 8.5.
So,...
13. ## Thread: Few Problems on Mixtures that I am looking for help!

by Brent Hanneson
Replies
6
Views
5,314

### Re: Few Problems on Mixtures that I am looking for help!

Please post only one question per thread. Otherwise things can become pretty complicated when there are discussions on multiple questions.

Cheers,
Brent
14. ## Thread: Combinatorics - Counting

by Brent Hanneson
Replies
1
Views
724

### Re: Combinatorics - Counting

Way out of scope for the GRE.

Cheers,
Brent - Greenlight Test Prep
15. ## Thread: Probability question. Pls try

by Brent Hanneson
Replies
19
Views
2,981