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Discrete Math: Graph Theory
Graph theory is a very large topic within discrete mathematics.
Graph theory involves working with diagrams that consist of points,
called vertices, and line segments, called edges. A few of the topics
within graph theory include critical paths
(Mud Slides and
Critical Paths), minimal cost spanning trees
(Minimal Minnie's
Cost), Euler paths/circuits
(The West Nile Virus
Carrying Mosquito Problem), and vertex coloring
(Beds of Flowers).
The problems below include these types of problems, as well as other
problems that involve graphs.
For background information elsewhere on our site, explore the
High School Discrete
Math area of the Ask Dr. Math archives. To find relevant
sites on the Web, browse and search
Discrete Mathematics
in our Internet Mathematics Library.
Access to these problems requires a Membership.

Beds of Flowers
 Dona Coffey

Discrete Math, difficulty level 2. Dona wants to separate her types of flowers and the colors of her flowers into separate beds. How many beds will she have to dig?
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Binary Trees
 Steve Maurer

Discrete Math, difficulty level 3. Given the definition of binary trees, students discover the relation between interior vertices and leaves and prove that relation.
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Changing Places
 Ethel Breuche

Discrete Math, difficulty level 3. This puzzle requires you to swap chips on an unusual game board.
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Cooking Dinner
 Leigh Nataro

Discrete Math, difficulty level 2. Using graphs and critical paths, find the amount of time it takes to make dinner.
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Delivering Toys for the Holidays
 Leigh Nataro

Discrete Math, difficulty level 4. Using two different algorithms, find the distance traveled in creating a Hamilton circuit.
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Dona and Dennis Go Traveling
 Dona Coffey

Discrete Math, difficulty level 2. Using matrix addition, students determine how many means of transportion they have in getting from city to city.
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A Game from West Africa
 Cara Crosby

Discrete Math, difficulty level 3. This tictactoe like game from Ghana has some good playing strategies and some graph theory applications.
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Gussie the lost Albino Emperor Penquin Pup
 Ron Murdoch

Discrete Math, difficulty level 2. Find Gussie, a penguin pup hiding in a zoo building with nineteen rooms, before he suffers from hunger shock.
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Heads or Tails
 Leigh Nataro

Discrete Math, difficulty level 2. Is it possible to have an arrangement of four coins go from HHHH to TTTT based on the rules given for flipping the coins?
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High School Reunion
 Leigh Nataro

Discrete Math, difficulty level 1. Find the minimum number of meeting times needed so that no committee member will miss a meeting.
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Homework Phone Pals
 Leigh Nataro

Discrete Math, difficulty level 1. Using the given clues, figure out which students are homework phone pals.
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How Many Graphs?
 Joseph Rosenstein

Discrete Math, difficulty level 3. How many essentially different graphs are there with six vertices, two of which have degree two, two degree three, and two degree four?
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The Inside Lines
 Larry Sue

Discrete Math, difficulty level 4. This problem makes use of Euler's formula and some geometry to find internal diagonals of regular polyhedra: tetrahedra, octahedra, and icosahedra.
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Intervals
 Stephen Maurer

Discrete Math, difficulty level 3. Students are given clues about intervals on the number line and must determine whether they intersect or not.
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King Euler's Blueprint
 Leigh Nataro

Discrete Math, difficulty level 1. Can you walk a path that will go through every doorway once?
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Minimal Minnie's Cost
 Ethel Breuche, Dona Coffey

Discrete Math, difficulty level 2. Building a rail line that connects a number of different cities: a problem that involves graph theory, minimal cost spanning trees, and algorithms.
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Mother's Chores
 Jim Greene

Discrete Math, difficulty level 1. A Traveling Salesperson Problem. Tom's mother needs to make several stops around the city and then get home. What is her shortest route without going back to one of the stops?
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Mud Slides and Critical Paths
 Ethel Breuche

Discrete Math, difficulty level 4. Can the coastal village rebuild the town after a mudslide before inclement weather returns? Given an order priority digraph, find the earliest completion time and critical path.
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New York Tours
 Sharon Edelkind

Discrete Math, difficulty level 2. Use vertex coloring to solve conflicting New York tour bus routes.
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Pothole Repair
 Leigh Nataro

Discrete Math, difficulty level 2. Plan a route for the road crews to take.
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Train Travel
 Dona Coffey

Discrete Math, difficulty level 2. Dona is in charge of setting up a new train service to connect nine towns in a county. What's the minimum cost?
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Vertices, Edges, and Regions
 Leigh Nataro

Discrete Math, difficulty level 2. Find a relation among vertices, edges, and regions of planar graphs.
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Wacky�s Fun and Games Amusement Park
 Natasha Hosein

Discrete Math, difficulty level 4. How can we minimize the number of clowns around the amusement park so that a child will never see two clowns at the same site?
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The West Nile Virus Carrying Mosquito Problem
 Lorraine Lurie

Discrete Math, difficulty level 2. Getting the trucks to spray for the virus in all five boroughs involves knowledge of some elementary graph theory and Euler's
theorems regarding traversible graphs.
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Which is the Dominant Team?
 Jennifer Stetz, Nicole Zayatz

Discrete Math, difficulty level 3. Determine which soccer team dominates the division.
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Yearbook Deadlines
 Leigh Nataro

Discrete Math, difficulty level 2. Find the critical path to determine the earliest time that the school yearbook can be completed.
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