Counting Principles

Featured Pro Problems

Slips of paper with digits and letters are drawn from baskets, with 161 possible results

Santa and Mrs. Claus take a Christmas song to extremes - The Twelve Days of Christmas

How many different Thanksgiving meals could I have?

How many different license plates can be created using these rules? A counting principles problem

Counting principles problem involving buttons and levers in combination

Determine the number of ways the customer can have his burger prepared

Place the markers in a tic-tac-toe grid in as many ways as possible.

In how many different ways can the letters STOPS be arranged?

Book Scrounger

Reviews and book lists - books we love!

Ask Professor Puzzler

The site administrator fields questions from visitors.

Like us on Facebook to get updates about new resources