Probability problem.

gAr · 2013-09-25 17:28:03

Fourth way by programming,
J code:

a=:i.1000
+/+/(+/"1(3#10)#:a)=/+/"1(3#10)#:a

We can shorten that a little:

+/+/=/~+/"1(3#10)#:a

Last edited by gAr (2013-09-25 19:30:02)

gAr · 2013-11-19 21:45:33

New problem:

A fair coin is tossed 20 times. What is the probability that there will be 5 or more consecutive heads?

Last edited by gAr (2013-11-24 02:45:44)

bobbym · 2013-11-20 02:05:49

Hi gAr;

gAr · 2013-11-20 02:42:51

Hi bobbym,

bobbym · 2013-11-20 02:48:09

Hi gAr;

gAr · 2013-11-20 02:53:01

bobbym · 2013-11-20 02:57:38

Hi gAr;

Trying to convince Agnishom to do some computer math.

gAr · 2013-11-20 03:03:02

That's nice, I think he's already doing some.

bobbym · 2013-11-20 03:05:24

Yes, some of my bad influence rubs off on most people sooner or later.

gAr · 2013-11-20 03:24:53

You're not a bad influence.
I ask people to stay away from non-free softwares, but most of them are reluctant to learn!

bobbym · 2013-11-20 03:28:56

Have you been keeping up with geogebra? They are almost done with it. Do you like the 3D?

gAr · 2013-11-20 03:55:19

Haven't used the recent releases.
Last time when I used 3D, processor was running at 100% even when left idle, don't know now.
Any significant changes you observed?

bobbym · 2013-11-20 03:58:52

I am not a big fan of 3D programs to begin with. I prefer living like a flatlander. I think they have come along alot but still need more work.

gAr · 2013-11-20 04:06:31

Me neither.

bobbym · 2013-11-20 04:12:02

I thought it was a little slow on my machine but it is only a dual core.

gAr · 2013-11-20 05:33:29

Even mine is a dual core, but I think it doesn't matter for most of the applications.

bobbym · 2013-11-20 05:50:43

Also, my graphics card is the low end one.

gAr · 2013-11-20 16:35:28

That's fine, CAS wouldn't require a graphics card. Though I think I've read recent mathematica versions make use of it.

bobbym · 2013-11-20 16:37:11

Yes, they use the Nvidia Cuda card. It speeds up things tremendously, I have a Radeon card.

Graphics are important when plotting 3D especially.

gAr · 2013-11-20 16:45:13

Yes, that's right.

bobbym · 2013-11-20 16:47:11

Not that I do alot of 3D work. I do not think there is any CAS that is as good as some other programs are at graphing.

gAr · 2013-11-20 16:57:37

I too rarely use 3d, and I recently saw that there's an option to view the plot in stereographic view in sage. But didn't try with the glasses yet.

bobbym · 2013-11-20 16:59:42

What kind of glasses do you use for it?

gAr · 2013-11-20 17:13:17

The red and cyan glasses, like the ones used for viewing 3d films.

By the way, is it feasible to create an option to mark the posts containing problems, and then create the links to those posts in one place (e.g. in the beginning of the thread)?
That will make the problems more visible.

Last edited by gAr (2013-11-20 17:26:04)

bobbym · 2013-11-20 21:30:50

Hi;

I am not able to do that. It would have to be done with source code of the forum.

Math Is Fun Forum

#51 2013-09-25 17:28:03

Re: Probability problem.

#52 2013-11-19 21:45:33

Re: Probability problem.

#53 2013-11-20 02:05:49

Re: Probability problem.

#54 2013-11-20 02:42:51

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#55 2013-11-20 02:48:09

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#56 2013-11-20 02:53:01

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#57 2013-11-20 02:57:38

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#58 2013-11-20 03:03:02

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#59 2013-11-20 03:05:24

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#60 2013-11-20 03:24:53

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#61 2013-11-20 03:28:56

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#62 2013-11-20 03:55:19

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#63 2013-11-20 03:58:52

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#64 2013-11-20 04:06:31

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#65 2013-11-20 04:12:02

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#74 2013-11-20 17:13:17

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#75 2013-11-20 21:30:50

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