Combinatorics

Combinatories

• Stringing Beads

  

  How many possible arrangements of blue and red beads you can make, in combinations of 2, 3, 4, or more? read more  

• How Many Balls Are in the Bag?

  

  I have a bag of balls. Each ball has a number on it that can be from 1 to 99. Not all those numbers are used and there are fewer than 99 balls. read more  

• How Many Licence Plates?

  

  The nation of Seedonia, issues license plates for all cars, trucks and motorcycles. Long ago the Ministry of Motor Vehicles (MMV) decided that every license plate would have 6 numbers, divided by a dash in the middle. read more  

• How Many Stamps Do You Need?

  

  In Seedonia you can mail a letter for 8 Seedos. (The Seedo is the unit of currency in Seedonia). read more  

• How Much to Pack?

  

  Sarina is packing her clothes for a week’s vacation with her family. read more  

• Number the Doors

  

  We invite you to find some unusual and interesting ways to number 20 things in sequence. read more  

• Polyominoes

  

  Everyone knows what a “domino” is: a game piece made of two adjacent squares.  read more  

• Polyominoes Puzzles

  

  Polyominoes are geometric objects made by connecting a certain number of squares with their sides matching.  read more  

• Three Cubes

  

  You have three cubes and on each side of each cube you write a two-digit number. read more