Lesson: Prime Numbers

Comment on Prime Numbers

For the GrE prep question of 150 to 159.in the option B why were the values of p and q changed?
greenlight-admin's picture

Question link: https://greprepclub.com/forum/if-p-and-q-are-different-prime-numbers-and...

Keep in mind that we're trying to eliminate 4 of the 5 answer choices.
So, we want to find values for p and q that make 4 of the 5 answer choices true.

We're told that p and q are different prime numbers.
So, as I test each answer choice, I can use any two prime numbers for p and q.

For answer choice B, If we use the same values we used for A, (p = 3 and q = 5), then we're unable to eliminate B (since those values make answer choice B false).

So, to be able to eliminate B, I had to test other values that could make B true.

Does that help?

Cheers,
Brent

Your math videos are really the best. Great explanations, and what's even better is how you aggregate questions from multiple sources.
greenlight-admin's picture

Thanks! I'm glad you like my videos!

Add a comment

Have a question about this video?

Post your question in the Comment section below, and I’ll answer it as fast as humanly possible.

Change Playback Speed

You have the option of watching the videos at various speeds (25% faster, 50% faster, etc). To change the playback speed, click the settings icon on the right side of the video status bar.

Let me Know

Have a suggestion to make the course even better? Email me today!

Free “Question of the Day” emails!