Games
Problems
Go Pro!

Problems > High School Math > 2004

Prove Composite

Oh, no, not another number theory problem?!

 

Suppose a²+ab+b²-c²-cd-d²=0, where a, b, c, d are positive integers.

Then I think a+b+c+d is a composite number. It is true? Prove it!

 

 

Note: Composite means "not prime." A composite number is a number that has factors other than one and itself.

 



View the solution
Row, Row, Row
Circle Game

Understanding Coronavirus Spread

A Question and Answer session with Professor Puzzler about the math behind infection spread.

Blogs on This Site

Reviews and book lists - books we love!
The site administrator fields questions from visitors.
Like us on Facebook to get updates about new resources
Home
Pro Membership
About
Privacy