Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫  π  -¹ ² ³ °

You are not logged in.

## #1 Re: Dark Discussions at Cafe Infinity » """Friends"""" » 2010-07-20 00:38:34

ZHero wrote:

Books are a Man's BEST FRENDS!

Buy yourself... mmmm... may be Pent House?

I agree with Bobbym, DOGS are man's bestfriend.
dogs can show you what a real friend truly means.

They say: Diamonds are woman's bestfriend.
I said: Cats should be woman's bestfriend.

## #2 Re: Dark Discussions at Cafe Infinity » """Friends"""" » 2010-07-19 00:52:44

Your life will be nothing if you don't have friends..

No man is an island.
You need other people, whether they are good or bad, they will teach you what life is all about.

## #3 Re: Introductions » Hi, I think I like number theory » 2009-10-19 23:01:44

hello listening..
welcome to this forum.
hope you enjoy your stay here...

you say you like number theory??
LOL i love that subject. >.<

## #4 Re: Introductions » Hello » 2009-10-19 22:58:47

hello Equalto!! XD

welcome to this forum.
enjoy your stay here.. ^_^

## #5 Re: Introductions » Hello everyone! » 2009-09-30 03:50:03

hello bkrKimo!! ^_^
welcome to the forum. XD

## #6 Help Me ! » Synthetic Division » 2009-08-04 23:25:12

haruka-san
Replies: 1

I have one question about synthetic division...
In this process, the last number in the 3rd row is the remainder, i know that remainder is always positive.
but, what if the number that you get is negative?

so what does that mean?

## #7 Re: Introductions » Hi everybody » 2008-09-04 21:00:20

hello G. Einstein
Welcome!

## #8 Re: Introductions » Dan Howitt in the math-house » 2008-05-18 23:01:33

hi dan!!! ^_^
i like the shirt... i hope to see that in the market.... hehe
welcome to the forum.
enjoy! ^_^

## #9 Re: Introductions » (Introduce myself) » 2008-05-18 22:55:22

hi grampr!
welcome to the forum...

^_^ enjoy!

hi lawrence!
welcome!

## #11 Exercises » Combination » 2008-01-07 15:37:13

haruka-san
Replies: 0

1.    How many ways are there to select 3 bracelets from a bow of 10 bracelets?

2.    How many ways can a committee of 4 people be selected from a group of 10 people?

3.    How many different possible test can be made from test bank of 20 questions if the test consist of 5 questions?

4.    How many ways can 3 cars and 4 trucks be selected from 8 cars and 11 trucks to be tested for a safety inspection?

5.    There are 7 women and 5 men in a department.
(a)    How many ways can a committee of 4 people be selected?
(b)    How many ways can this committee be selected if there must 2 men and two women on the committee
(c)    How many ways can this committee be selected if there must be at least 2 women on the committee?

6.    How many ways can a dinner patron select 3 salads of 2 vegetables if there are six salads and 5 vegetables on the menu?

7.    How many ways can a foursome of 2 men and 2 women be selected from 10 men and 12 women in a golf club?

8.    How many different ways can a computer programmer select 3 jobs from a possible 15?

9.    How many ways can a person select 8 videotapes from 10 tapes?

10.    An advertising manager decides to have an ad campaign in which 8 special calculators will be hidden at various location on a shopping mall. If he has 17 locations from which to pick, how many possible combinations can he choose?

## #12 Exercises » Permutation » 2008-01-07 15:33:39

haruka-san
Replies: 0

1.    In a board of directors composed of 8 people, how many ways can a chief executive officer, a director and a treasurer be selected?

2.    How many ways can 7 different types of soaps be displayed on a shelf in a grocery store?

3.    An inspector must select 3 tests to perform in a certain order on a manufactured part. He has a choice of 7 tests. How many ways can he perform 3 different tests?

4.    The Anderson Research Company decides to test market a product in 6 areas. How many different ways can 3 areas be selected in a certain order for the first test?

5.    How many different ways can 4 tickets be selected from 50 tickets if each ticket wins a different prize?

6.    How many different signals can be made by using at least 3 distinct flags if there are 5 different flag from which to select?

7.    How many different code words can be made using the letters A, A, A, B, B, C, D, D, D, D if the word must contain 10 letters?

8.    A store owner has 50 items to advertise and she can select one different item each week for the next 6 weeks to put on special. How many different ways can the selection be done?

9.    How many different ways can 5 people A, B, C, D and E seat in a row at a movie theater if
(a)    A and B must sit together
(b)    C must sit to the right of, but not necessarily next to, B.
(c)    D and E will not seat next to each other

## #13 Exercises » Fundamental Counting Principles » 2008-01-07 15:32:15

haruka-san
Replies: 0

1.    A woman has 3 skirts, 5 blouses and 4 scarves. How many different outfits can she wear assuming that they are color coordinated?

2.    How many different ways can 6 speakers be seated a row on speakers platform?

3.    Seven dice are rolled. How many different outcomes are there?

4.    At educational film festival 8 film are to be shown. How many different ways can these 8 films be shown?

5.    How many different 4-digit identification tags can be made if the digits can be used more than once? If the first digit must be a 7 and repetitions are not permitted?

6.    If a baseball manager has 5 pitchers and 2 catchers, how many different possible pitcher-catcher combinations can he field?

7.    A coin is tossed 8 times. How many different outcomes are there?

8.    Given the digits 0,1,2,3,5 and 6, how many different 4-digit numbers can be made that are visible by 4 if repetitions are allowed? If repetitions are not allowed?

9.    How many different ways can a person select one or more coins if he has two - one peso,  one - five pesos and one  ten pesos?

10.    In a barnyard there is an assortment of chickens and cows. Counting heads, one gets 15; counting legs, one gets 46. How many of each are there?

## #14 Help Me ! » Statistics » 2007-12-03 18:40:37

haruka-san
Replies: 0

Prove that

s²=((n∑fx²-(∑fx)²)/(n(n-1)))=c²[((n∑fd²-(∑fd)²)/(n(n-1)))]

Where c = class size and d = values of deviation

## #15 Help Me ! » help!!!!!asap » 2007-11-27 19:34:18

haruka-san
Replies: 2

prove that

one over square root of two pi times the integral of e raise to negative one half x squared, dx from positive infinity to negative infinity is equal to one.

## #16 Help Me ! » I need help. » 2007-11-22 22:56:38

haruka-san
Replies: 0

hello,

What are the exact values of 1/2! and -1/2!
(what are the exact values of one half factorial and negative one half factorial?)

compute

1. C (-8,8)
2. C (-4,14)
3. C (-16,4)
4. C (-11,5)
5. C (-20,13)

## #17 Re: Introductions » Hi! » 2007-11-17 22:55:06

hello. Welcome to mathisfun forum!

^_^

## #18 Help Me ! » What is a good topic for a statistical research? » 2007-11-17 22:52:37

haruka-san
Replies: 4

hi,
right now i am taking the subject statistics, and we will be having a research work or should i say a baby thesis.
and i am thinking of a topic to research.

i know many of you here have a good idea.
Can you give me a topic for my research?
uhmm... i want something unique.:P

thanks.

wahaha!

## #20 Jokes » The Story of the Frog. » 2007-11-08 23:22:17

haruka-san
Replies: 3

Frog: What does my future hold?

Fairy: Youll meet someone who wants to know everything about you.

Frog: GREAT! Will I meet her in a party?

Fairy: NO

In a Biology Class.

:P:P

## #21 Re: Help Me ! » Statistics: Definition of Terms » 2007-11-02 19:12:06

thanks John E. Franklin!
you helped me a lot.

^_^

## #22 Help Me ! » Statistics: Definition of Terms » 2007-10-29 22:47:05

haruka-san
Replies: 2

Can you please help me with this?! because i find it a bit long...

---------------

Define the following terms and give at least 2 examples in each term.
1. Quantitative data
2. Qualitative data
3. Discrete variable
4. Continuous variable
5. Dichotomous
6. Trichotomous
7. Multinomous

for scales of measurements
1. Nominal
2. Ordinal
3. Interval
4. Ratio

for sources of data
1. Primary
2. Secondary

For collection of data
1. Interview
2. Questionnaire
3. Observation
4. registration or Census
5. Experimentation

for statistical presentations
1. Textual
2. Tabular
3. Graphical / Chart
a. line graph
b. bar graph
c. pie graph
d. pictograph
e. map /cartogram
f. scatter diagram

for sampling procedures and procedures
1. Target population
2. Accessible population
3. Element
4. sampling Frame
5. Probability Sampling
-- simple random sampling
-- systematic sampling
-- stratified random sampling
-- cluster sampling
6. Nonprobability sampling
-- convenience or accidental / incidental sampling
-- quota sampling
-- purposive sampling

----------------------------------

Thanks! ^_^

## #23 Help Me ! » Pairs of Primes » 2007-09-11 00:39:29

haruka-san
Replies: 1

Find all pairs of primes p and q satisfying p-q=3

## #24 Help Me ! » prime number! » 2007-09-11 00:37:00

haruka-san
Replies: 1

Can someone help me answer this?

Given that p does not divide n for all prime.
p is less than or equal to cube root of n.

Show that n is either a prime or the product of two prime.

(Hint: Assume to the contrary that n contains at least three prime factors.)

## #25 Help Me ! » positive integral solution. » 2007-08-29 00:11:18

haruka-san
Replies: 10

how to get the positive integral solution if
x= t +5
y= 5s-t
z= -3s-1

please give me the solution.

thanks.
mwah!