Lesson: Counting Strategies - Part II

Comment on Counting Strategies - Part II

Dear sir,
I m trying to solve all the reinforcement activities. Apart from these from where I should practice the Gre level questions. (Especially counting and data interpretation) Kindly suggest.
Regards
greenlight-admin's picture

GRE Prep Club is an excellent source of all GRE questions (official questions and unofficial questions).

Just use their question filter (here https://greprepclub.com/forum/viewforumtags.php) to filter your questions by question type.

Cheers,
Brent

Thanks for the help.

Hi, I had difficulty solving this question: https://greprepclub.com/forum/tricky-there-are-n-teams-playing-in-a-basketball-tournam-11153.html. I still couldn't solve it after looking at the solution.

What is the approach in solving this question?

Thanks,
Manmeet
greenlight-admin's picture

This is a crazy hard question.
Here's my full solution: https://greprepclub.com/forum/tricky-there-are-n-teams-playing-in-a-bask...

Cheers,
Brent

Hi Brent,

In the Magoosh sample problem with the 7 points on a circle and creating triangles from the points, how is the fact that three verticies next to each other will not form a triangle? Does 7C3 account for that?
greenlight-admin's picture

Question link: https://www.youtube.com/watch?v=OQpybhVoPms

But 3 adjacent points WILL form a triangle.
You may be thinking of counting questions that are set up similarly, but ask you to count the number of DIAGONALS (not triangles).
When counting diagonals, we must recognize that connecting one vertex to an adjacent vertex will not create a diagonal.

Does that help?

Cheers,
Brent

Ahh yes, that's what I was thinking. Can you go through the diagonals question again? I've seen it somewhere, but cannot find it. Thanks Brent!

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