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#201 2011-02-02 14:35:23

gAr
Member
Registered: 2011-01-09
Posts: 3,479

Re: Is this cool with you?

Hi bobbym,

I changed my answer, sorry for the delay.


"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense"  - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

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#202 2011-02-02 19:11:03

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,262

Re: Is this cool with you?

No problem at all, the old guy made yet another typo. Soon under the new regime they will be putting him to sleep, permanently. Or maybe in the coming food riots they will eat him. Either way, then he can go to the big forum in the sky. The computers are faster there and he can live out eternity computing zillions of digits in the decimal expansion of 7 / 9.


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

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#203 2011-02-02 19:48:24

gAr
Member
Registered: 2011-01-09
Posts: 3,479

Re: Is this cool with you?

Nah, we learn more if there are typos...
We think of more ways till we are assured it's a typo!


"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense"  - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

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#204 2011-02-02 20:29:10

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,262

Re: Is this cool with you?

You have a point there.


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Online

#205 2011-02-03 15:39:49

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,262

Re: Is this cool with you?

S = { 1,2,3,4,5,6,7, ... 1000 }. C adds 1 to every 2nd element, 1 to every 3rd element all the way up to every nth element. If n is 250 then what is 2nd largest element in the set now.

A says) 32
B says) That is not right.
C says) Requires a computer.
D says) Not really, A is right.


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Online

#206 2011-02-03 17:42:33

gAr
Member
Registered: 2011-01-09
Posts: 3,479

Re: Is this cool with you?

Hi,

Last edited by gAr (2011-02-03 19:06:30)


"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense"  - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

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#207 2011-02-03 21:52:30

Howardroark
Member
Registered: 2010-10-10
Posts: 382

Re: Is this cool with you?

Hi bobbym,


I come from a civilization which has given the world the number 0..

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#208 2011-02-03 22:00:41

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,262

Re: Is this cool with you?

Hi all;

Answer verified. Those answers are close but they are not correct. Please give it another try.


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Online

#209 2011-02-03 22:20:11

gAr
Member
Registered: 2011-01-09
Posts: 3,479

Re: Is this cool with you?

Hi bobbym,

Check whether my understanding of the problem is correct:
For n=5,   sequence is: 1 3 4 6 6 8 7 10 10 12 11 15 13 15 17 18 17 20 19...
For n=10, sequence is: 1 3 4 6 6 9 8 11 11 13 11 16 13 16 17 19 17 22 19...


"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense"  - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

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#210 2011-02-03 22:27:31

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,262

Re: Is this cool with you?

Hi;

That is not correct. Remember the first time all of them get incremented by 1.


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Online

#211 2011-02-03 22:33:46

gAr
Member
Registered: 2011-01-09
Posts: 3,479

Re: Is this cool with you?

But the question says "C adds 1 to every 2nd element", so why are we adding 1 to all?!


"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense"  - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

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#212 2011-02-03 22:40:11

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,262

Re: Is this cool with you?

Hi;

But the question says "C adds 1 to every 2nd element"

Darn you would say that. Why must they always read the questions, I do not? Because of that now we have parity. All 3 of us have wrong answers.


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Online

#213 2011-02-03 22:43:09

gAr
Member
Registered: 2011-01-09
Posts: 3,479

Re: Is this cool with you?

Hi,

Last edited by gAr (2011-02-03 22:45:54)


"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense"  - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

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#214 2011-02-03 22:46:02

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,262

Re: Is this cool with you?

Hi ;

That was my answer but you have refuted it in post #212 and #213.

I have conceded that the question is as you see it. But all the answers are still currently wrong.


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Online

#215 2011-02-03 22:51:20

gAr
Member
Registered: 2011-01-09
Posts: 3,479

Re: Is this cool with you?

Hi,

My computer says answer is 1010, I only have the program to blame!


"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense"  - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

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#216 2011-02-03 22:55:19

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,262

Re: Is this cool with you?

That is close but it is clear that you were on the right track with your sequence in post #210. That sequence is correct and leads to the correct answer.


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Online

#217 2011-02-03 22:57:05

Howardroark
Member
Registered: 2010-10-10
Posts: 382

Re: Is this cool with you?

Hi bobbym,

Last edited by Howardroark (2011-02-03 22:58:51)


I come from a civilization which has given the world the number 0..

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#218 2011-02-03 22:59:12

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,262

Re: Is this cool with you?

Hi Howardroark;

That is a couple off.

since you r saying that one is added to all of

That has been refuted in post #212 and #213. Simply by reading the problem correctly as you both did.


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Online

#219 2011-02-03 23:02:17

Howardroark
Member
Registered: 2010-10-10
Posts: 382

Re: Is this cool with you?

Hi bobbym,


I come from a civilization which has given the world the number 0..

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#220 2011-02-03 23:09:28

gAr
Member
Registered: 2011-01-09
Posts: 3,479

Re: Is this cool with you?

Hi all,


"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense"  - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

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#221 2011-02-03 23:11:03

Howardroark
Member
Registered: 2010-10-10
Posts: 382

Re: Is this cool with you?

Hi all,

I think gAr is right.. i didn't try for 990.. i was a fool to try till 995


I come from a civilization which has given the world the number 0..

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#222 2011-02-03 23:14:56

Howardroark
Member
Registered: 2010-10-10
Posts: 382

Re: Is this cool with you?

Hi,
I verified gAr's answer with wolfram alpha..It has totally 24 divisors


I come from a civilization which has given the world the number 0..

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#223 2011-02-03 23:15:01

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,262

Re: Is this cool with you?

Alright let me show what I have and let us see if we can agree.

This is the front 10 and the back 10 of sequence after C finished with it.

Divisors of 1000 are:

So 1000 gets incremented 13 times = 1013 = maximum.

Divisors of 990:

So 990 gets incrememnted 20 times = 1010 = 2nd largest.


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

Online

#224 2011-02-03 23:15:42

gAr
Member
Registered: 2011-01-09
Posts: 3,479

Re: Is this cool with you?

Hi Howardroark,

Did you do it manually?
Isn't it tiresome?


"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense"  - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

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#225 2011-02-03 23:17:20

Howardroark
Member
Registered: 2010-10-10
Posts: 382

Re: Is this cool with you?

Hi bobbym,

I Agree..


I come from a civilization which has given the world the number 0..

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