# 0.11 Sets and counting: homework

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This chapter covers principles of sets and counting. After completing this chapter students should be able to: use set theory and venn diagrams to solve counting problems; use the multiplication axiom to solve counting problems; use permutations to solve counting problems; use combinations to solve counting problems; and use the binomial theorem to expand x+y^n.

## Sets and counting

Find the indicated sets.

List all subsets of the following set.

$\left\{\text{Al, Bob}\right\}$
$\left\{\text{Al, Bob}\right\},\left\{\text{Al}\right\},\left\{\text{Bob}\right\},Ø$

List all subsets of the following set.

$\left\{\text{Al, Bob, Chris}\right\}$

List the elements of the following set.

$\left\{\text{Al, Bob, Chris, Dave}\right\}\cap \left\{\text{Bob, Chris, Dave, Ed}\right\}$
$\left\{\text{Bob, Chris, Dave}\right\}$

List the elements of the following set.

$\left\{\text{Al, Bob, Chris, Dave}\right\}\cup \left\{\text{Bob, Chris, Dave, Ed}\right\}$

In Problems 5 - 8, let $\text{Universal set}=U=\left\{a,b,c,d,e,f,g,h,i,j\right\}$ , $V=\left\{a,e,i,f,h\right\}$ , and $W=\left\{a,c,e,g,i\right\}$ .

List the members of the following sets.

$V\cup W$
$\left\{a,e,i,f,h,c,g\right\}$
$V\cap W$
$\overline{V\cup W}$
$\left\{b,d,j\right\}$
$\stackrel{ˉ}{V}\cap \stackrel{ˉ}{W}$

In 9 - 12, let $\text{Universal set}=U=\left\{1,2,3,4,5,6,7,8,9,\mathrm{10}\right\}$ , $A=\left\{1,2,3,4,5\right\}$ , $B=\left\{1,3,4,6\right\}$ , and $C=\left\{2,4,6\right\}$ .

List the members of the following sets.

$A\cup B$
$\left\{1,2,3,4,5,6\right\}$
$A\cap C$
$\overline{A\cup B}\cap C$

Ø

$\stackrel{ˉ}{A}\cup \overline{B\cap C}$

Find the number of elements in the following sets.

In Mrs. Yamamoto's class of 35 students, 12 students are taking history, 18 are taking English, and 4 are taking both. Draw a Venn diagram and determine how many students are taking neither history nor English?

9 students

In the County of Santa Clara 700,000 people read the San Jose Mercury News, 400,000 people read the San Francisco Examiner, and 100,000 read both newspapers. How many read either the Mercury News or the Examiner?

A survey of athletes revealed that for their minor aches and pains, 30 used aspirin, 50 used ibuprofen, and 15 used both. How many athletes were surveyed?

65

In a survey of computer users, it was found that 50 use HP printers, 30 use IBM printers, 20 use Apple printers, 13 use HP and IBM, 9 use HP and Apple, 7 use IBM and Apple, and 3 use all three. How many use at least one of these Brands?

This quarter, a survey of 100 students at De Anza college finds that 50 take math, 40 take English, and 30 take history. Of these 15 take English and math, 10 take English and history, 10 take math and history, and 5 take all three subjects. Draw a Venn diagram and determine the following.

1. The number of students taking math but not the other two subjects.
2. The number of students taking English or math but not history.
3. The number of students taking none of these subjects.
1. 30
2. 60
3. 10

In a survey of investors it was found that 100 invested in stocks, 60 in mutual funds, and 50 in bonds. Of these, 35 invested in stocks and mutual funds, 30 in mutual funds and bonds, 28 in stocks and bonds, and 20 in all three. Determine the following.

1. The number of investors that participated in the survey.

2. How many invested in stocks or mutual funds but not in bonds?

3. How many invested in exactly one type of investment?

## Tree diagrams and the multiplication axiom

Do the following problems using a tree diagram or the multiplcation axiom.

A man has 3 shirts, and 2 pairs of pants. Use a tree diagram to determine the number of possible outfits.

6

do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
it is a goid question and i want to know the answer as well
Maciej
Abigail
Do somebody tell me a best nano engineering book for beginners?
what is fullerene does it is used to make bukky balls
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
so some one know about replacing silicon atom with phosphorous in semiconductors device?
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
for screen printed electrodes ?
SUYASH
What is lattice structure?
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
what's the easiest and fastest way to the synthesize AgNP?
China
Cied
types of nano material
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
what is nano technology
what is system testing?
preparation of nanomaterial
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
what is system testing
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
how did you get the value of 2000N.What calculations are needed to arrive at it
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Berger describes sociologists as concerned with
8. It is known that 80% of the people wear seat belts, and 5% of the people quit smoking last year. If 4% of the people who wear seat belts quit smoking, are the events, wearing a seat belt and quitting smoking, independent?
Mr. Shamir employs two part-time typists, Inna and Jim for his typing needs. Inna charges $10 an hour and can type 6 pages an hour, while Jim charges$12 an hour and can type 8 pages per hour. Each typist must be employed at least 8 hours per week to keep them on the payroll. If Mr. Shamir has at least 208 pages to be typed, how many hours per week should he employ each student to minimize his typing costs, and what will be the total cost?
At De Anza College, 20% of the students take Finite Mathematics, 30% take Statistics and 10% take both. What percentage of the students take Finite Mathematics or Statistics?