Question: Number of Primes

You need an account to watch this video

flag video to
rewatch later

Comment on Number of Primes

Really, it's better to learn

jimmythepenguin1 - April 11, 2017

Really, it's better to learn the prime numbers up to 97, right?

The more primes the better :-

greenlight-admin - April 11, 2017

The more primes the better :-)

Nice solution. Could you please tell me in which lesson did you explain that, if the addition of to digits is 15, then that number is divisible by 3. I mean the case for 87 how to know that is divisible by 3?.

I cover divisibility rules

greenlight-admin - July 30, 2017

I cover divisibility rules here: https://www.greenlighttestprep.com/module/gre-integer-properties/video/822

Have a question about this video?

Post your question in the Comment section below, and a GRE expert will 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 us today!