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Combinatorics

Sets - List the elements in the set.1

Write the word or phrase that best completes each statement or answers the question. List the elements in the set. 1. Let U = { q,r,s,t,u,v,w,x,y,z} A = { q,s,u,w,y} B = {q,s,y,z,} C = { v,w,x,y,z} a. (A INTERSECT B') U (B INTERSECT A') B. A'-C Use the formula for the number of subsets o

Relations and sets

1) Find a relation R on a set S that is neither Symmetric nor antisymmetric 2) Let S be a set containing exactly n elements. How many antisymmetric relations on S are there. 3) give a recursive definition of X^n for any positive integer n 4) give a recursive definition of the nth odd positive integer 5) Let g: Z -> Z

Counting and subsets

Use the formula for the number of subsets of a set with n elements to solve the problem. 1. Pasta comes with tomato sauce and can be ordered with some , all, or none of these ingredients in the sauce: {onions, garlic, carrots, broccoli,shrimp, mushrooms, zucchini, green pepper}. How many different variations are available for

Permutations and combinations..

In the design of an electrical product, 7 different components are to be stacked in a cylindrical casing that holds 12 components,in a manner that minimizes the impact of shocks. One end of the casing is designated as the top and the other end the bottom. a) how many different designs are possible b) If the seven compon

Standard Combinatorics

Problem 1) We have 20 kinds of presents; and we have a large supply of each kind. We want to give presents to 12 children. It is not required that every child gets something; but no child can get 2 copies of the same present. In how many ways can we give presents? Problem 2) List all subsets of {a,b,c,d,e} containi

Combinations of Letters and Digits

Could someone show me how to solve the following. 20. How many different license plates can be made if each license plate consists of three letters followed by three digits or four letters followed by two digits?

Set Partitions and Bit Strings

Which of these collections of subsets are partitions on the set of bit strings of length 8? a) The set of bit strings that end with 00; the set of bit strings that end with 01; the set of bit strings that end with 10; and the set of bit strings that end with 11. b) The set of bit strings that end with 111; the set of bit

Union and Intersection of Sets

Create 2 sets. Set A will be the list of the 5 items you personally need to buy the most (essential items). Set B will be the list of 5 items that you want to buy the most ( fun stuff). List the items in set A and B and also list or state the items in the union and in the intersection of set A nad B Assume that the prices of

Solving a Combinations Problem

Mrs. Jones had some white paint and some green paint, and a bunch of wooden cubes. Her class decided to paint the cubes by making each face either solid white or green. Juan painted his cube with all six faces white. Julie painted her cube solid green. Herman painted 4 faces white and 2 faces green. How many cubes could be paint

Abstract Algebra : Permutations, Binary Operations and Mappings

Consider a non-empty set A. Prove that S(A) is closed in (M(A),o). Meaning: "o" is the composition of functions which defines a binary operation on M(A), the set of all maps from A to A. You need to prove that the set of all permutations on A is closed under the composition.

Combinations

A representative of the Environmental Protection Agency wants to select samples from 10 landfills. The director has 15 landfills from which she can collect samples. How many different samples are possible?

Set Operations

1. Write the following in roster form: Set N is the set of natural numbers between ten and sixteen 2. Express the following in set builder notation: Z = {2, 3, 4, 5, 6, 7, 8, 9, 10} 3. For sets A and B, determine whether A = B, A is a subset of B, or B is a subset of A

Vertices, Nodes, Breadth-First Search Algorithm and Rooted Trees

1. Use the breadth first search algorithm to find a spanning tree for the following connected graph. Start with A and use alphabetical order when there is a choice for a vertex. 2. For the following rooted tree, identify the following: (a) Which node is the root? (b) Which nodes are the internal vertices? (c) Is th

Combinations Expansion Subsets

1. The coefficient of x^7y^2 in the expansion of (2x-y)^9 2. How many subsets of {2,3,5,7,11, 13, 17,19,23) contain four numbers? 3. If a committee varies its meeting days, how many meetings must it schedule before we can guarantee that at least two meetings will be held on the same day of the week?? 4. How many differe

How Combinations Are Determined

A woman has 9 close friends. (a) In how many ways can she invite five of these to dinner? Explain/show work. (b) Repeat part (a) with the added stipulation that two of her friends do not like each other so that if she invites one of them she cannot invite the other. Explain/show work. (c) Repeat part (a), assuming t

Show that a set of real rational functions is a field.

NOTE: In this description, R represents the symbol for the set of real numbers. I couldn't find a way to type or copy the correct R symbol for the set of real numbers. Also, the parentheses in R(x) is used to distinguish the ring R(x) of rational functions from the ring R[x] of polynomials. Show that the set R(x) of rational

Graphs, Digraphs, Trees and Forests

I am posting one problem from Exercise 2.2, I need answer for 2.9. I am posting another question from Exercise 3.1: Problem 3.2.) Prove that a graph G is a forest if and only if every induced subgraphs of G contains a vertex of degree at most 1. Problem 3.1) Draw all forests of order 6. See attached file for full pr

14 questions: probabilities, expected value, combinations/permutations

I need help in showing how the attached problems are worked out. Thanks ... 1. During the last hour, a telemarketer dialed 20 numbers and reached 4 busy signals, 3 answering machines, and 13 people. Use this information to determine the empirical probability that the next call will be answered in person. 2. If you ro

Combinations and Permutations

1) Identify each of the following 1) as a permutation or combination and 2) as with or without replacement: a) Social security numbers b) Books in your backpack c) Numbers chosen for the "Big" lotto d) The cards in your hand for a card game e) Lunch chosen by a student from the cafeteria menu 2) A

Statistics Problem Set

See attached file for full problem description. 1. If A  B and B  C, what can you conclude? Why? What if A  B and B  C? If A  B and B  C? 2. Write down all possible subsets of {a, b, c, d} 3. Without writing them down what are the number of subsets of the set A = {a, b,

Permutation or Combination Calculations

For each question determine if the situation is a permutation or combination and if it is with or without replacement, then determine the answer. 1 Identify each of the following 1) as a permutation or combination and 2) as with or without replacement: a) Social security numbers b) Books in your backpack c) Numbers chosen

Discrete Math : Combinations, Permutations and Probability (25 MC Problems)

This test consists of 25 equally weighted questions. 1. Given a two-step procedure where there are n1 ways to do Task 1, and n2 ways to do Task 2 after completing Task 1, then there are _________ ways to do the procedure. a. n1 + n2 b. n1 log n2 c. n1 * n2 d. n12 2. How many bit strings of length 10 begin with 1101? a.