Challenge Level

This group tasks allows you to search for arithmetic progressions in the prime numbers. How many of the challenges will you discover for yourself?

Challenge Level

Are these statistical statements sometimes, always or never true? Or it is impossible to say?

Challenge Level

Can you match the charts of these functions to the charts of their integrals?

Challenge Level

Which of these triangular jigsaws are impossible to finish?

Challenge Level

Explore the properties of some groups such as: The set of all real numbers excluding -1 together with the operation x*y = xy + x + y. Find the identity and the inverse of the element x.