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  •  » [Discrete Math] Finals review problems in Probability

#26 2012-12-14 10:09:58

bobbym
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Re: [Discrete Math] Finals review problems in Probability

Do you have the book? It is on page 431 of the sixth edition and he gives 3 examples after the derivation.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

#27 2012-12-14 10:14:54

anonimnystefy
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Re: [Discrete Math] Finals review problems in Probability

Is it anywhere in the 7th edition?


The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

#28 2012-12-14 10:22:39

bobbym
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Re: [Discrete Math] Finals review problems in Probability

Hi;

It is on p 483 in the seventh edition. Looks okay.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

#29 2012-12-14 10:34:22

bobbym
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Re: [Discrete Math] Finals review problems in Probability

Hi

Festisio wrote:

The calculation they use.. it makes a bunch of assumptions.. they are based on prior proofs..

So why would not use the formula he gave at the bottom? That is how he gets his answer.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

#30 2013-06-05 20:38:47

fizzy-flow
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Re: [Discrete Math] Finals review problems in Probability

hey guys i'm not sure how to solve this question and was hoping for someone to help me out :s
(i'm studying for an exam and i'm not sure how they got the answer or if its right or wrong)
thanks in advance

A "pair" of socks is two socks of the same colour. i have 17 identical red socks and 12 identical blue socks in a bag. how many socks must i pull out of the bag ( while i'm blindfolded) to be sure of getting two pairs of socks, of wither colour?

#31 2013-06-05 22:38:18

anonimnystefy
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Re: [Discrete Math] Finals review problems in Probability

I would say the answer is 5.


The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

#32 2013-06-05 22:44:27

bobbym
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Re: [Discrete Math] Finals review problems in Probability

Hi;

I thought 18.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

#33 2013-06-06 03:31:58

bob bundy
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Re: [Discrete Math] Finals review problems in Probability

Hi fizzy-flow

Welcome to the forum.

If four are picked of the same colour then we're done so let's try hard to avoid that.  Call the colours x and y.

So avoid xxxx and yyyy.

xxyy means we're done so let's avoid that too

So xxxy or yyyx are the only ways to be sure we haven't yet got two pairs.

So now pick another.

Four possibilities xxxyy or xxxyx or yyyxx or yyyxy

All of these result in two pairs,  so I think 5 is the answer, too.

Bob


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

#34 2013-06-06 03:39:32

anonimnystefy
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Re: [Discrete Math] Finals review problems in Probability

bobbym wrote:

Hi;

I thought 18.

Hi bobbym

Two socks of the same colour make a pair, not of different colours.


The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

#35 2013-06-06 03:53:09

bob bundy
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Re: [Discrete Math] Finals review problems in Probability

Maybe not in bobbym's world.  One man's fashion is another man's individualism.  smile

But even then, it'd have to be 19, to get R-B, R-B

Bob


Uploaded Images
View Image: socks.gif      


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

#36 2013-06-06 04:00:02

anonimnystefy
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Re: [Discrete Math] Finals review problems in Probability

True.

People like him actually wear green socks.


The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

#37 2013-06-06 04:04:38

bob bundy
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Re: [Discrete Math] Finals review problems in Probability

I had a strange internet moment.

I wanted to take the saying "One man's meat is another man's poison" and make it "One man's fashion is another man's .....?" What?  I couldn't think of a word.  So I went to an antonym dictionary but it wasn't much help.  So I googled "antonym fashion" and got inundated with offers to sell me some.  smile

Bob


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

#38 2013-06-06 04:11:43

anonimnystefy
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Re: [Discrete Math] Finals review problems in Probability

Fashion doesn't seem like a noun with an antonym.

Speaking of antonyms and such, I have just been surprised by the fact that the adjective interested has two antonyms.

I think bobbym might also have some maroon socks.


The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

#39 2013-06-06 04:16:57

bob bundy
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Re: [Discrete Math] Finals review problems in Probability

Only two?

Antonym word of happy:

"depressed, discouraged, dissatisfied, miserable, morose, pained, sad, sorrowful, unhappy"

synonym-antonym.com

Bob


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

#40 2013-06-06 04:17:35

anonimnystefy
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Re: [Discrete Math] Finals review problems in Probability

Two with different meanings.


The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

#41 2013-06-06 04:32:18

bob bundy
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Re: [Discrete Math] Finals review problems in Probability

I see what you mean.  I'll work on it.

Back later.

Bob


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

#42 2013-06-07 00:19:18

anonimnystefy
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Re: [Discrete Math] Finals review problems in Probability

Work on what?


The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

#43 2013-06-10 17:25:32

bob bundy
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Re: [Discrete Math] Finals review problems in Probability

hi Stefy,

These words are all antonyms of a certain word.  What is it?

bright
light
sunny
clean
shiny




Bob


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

#44 2013-06-10 21:36:49

anonimnystefy
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Re: [Discrete Math] Finals review problems in Probability

Are you sure those are all antonyms to that word? How is sunny opposite to that??


The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

#45 2013-06-10 22:01:50

bob bundy
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Re: [Discrete Math] Finals review problems in Probability

Yes.  I looked up a word that had lots of meanings.  Then I found the antonym for each meaning.  That gave the list.

Bob


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

#46 2013-06-12 20:07:12

phrontister
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Re: [Discrete Math] Finals review problems in Probability

Hi Bob,

Is this the answer?:


"The good news about computers is that they do what you tell them to do. The bad news is that they do what you tell them to do." - Ted Nelson

#47 2013-06-12 22:13:34

bob bundy
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Re: [Discrete Math] Finals review problems in Probability

hi Phro,

Well, I'll give it to you for the five words on show, but it wasn't the word I started with.  You have earned the right to peek at the hidden 6th word now.

Bob


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

#48 2013-06-12 23:18:18

phrontister
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Re: [Discrete Math] Finals review problems in Probability

Hi Bob,


"The good news about computers is that they do what you tell them to do. The bad news is that they do what you tell them to do." - Ted Nelson

#49 2013-06-13 01:51:09

bob bundy
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Re: [Discrete Math] Finals review problems in Probability

hi Phro

Another excellent try and yet not my word either.

I suppose this is the result of choosing a general purpose word.  It has lots of meanings including attempt #2.

smile

Bob


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

#50 2013-06-13 09:50:35

phrontister
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Re: [Discrete Math] Finals review problems in Probability

Hi Bob,

Thought I had it with that last one. sad

Hmmm....


"The good news about computers is that they do what you tell them to do. The bad news is that they do what you tell them to do." - Ted Nelson
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