Re: Maths- Gym for Brainiacs

by fatman123 Mon Jun 11, 2012 6:45 am

wait so thats the answer? you can make up the four block of land using more then four triangles?

by beatrixasdfghjk. Mon Jun 11, 2012 6:47 am

..
I was thinking along those lines, but then I rationalised that they were actually two separate triangles Maths- Gym for Brainiacs - Page 19 14047752796496505428

Maths- Gym for Brainiacs - Page 19 14047752796496505428

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by spanky Mon Jun 11, 2012 7:02 am

beatrixasdfghjk. wrote:..
I was thinking along those lines, but then I rationalised that they were actually two separate triangles .

+1

by Forza Mon Jun 11, 2012 7:24 am

by kiranr Mon Jun 11, 2012 10:44 am

Nice Forza. That is some nice problem solving Thumbs up

by Forza Mon Jun 11, 2012 11:01 am

kiranr wrote:
Nice Forza. That is some nice problem solving

thanks kiranr :bow:

by Babun Mon Jun 11, 2012 11:26 am

Forza Rossoneri wrote:

Forza, you cool cucumber, well done! eco smile

Your reward:

Spoiler:

beatrixasdfghjk. wrote:..
I was thinking along those lines, but then I rationalised that they were actually two separate triangles .

I don't pose normal questions eco smile

Keep it in mind while solving them eco smile

by spanky Mon Jun 11, 2012 11:47 am

+1 spoiler Very Happy

by Forza Mon Jun 11, 2012 12:45 pm

spoiler

by vizkosity Sun Jun 24, 2012 6:12 am

Here's a question for ya'll Smile

prove that 0.9999999999999999999.... = 1
formally

(use infinite geometric sum if you can)

by beatrixasdfghjk. Sun Jun 24, 2012 6:20 am

a = 0.9
r = 0.1

Sinfinite = a / (1 - r)
= 0.9 / (1 - 0.1)
= 0.9 / 0.9
= 1.

by vizkosity Sun Jun 24, 2012 6:29 am

beatrixasdfghjk. wrote:a = 0.9
r = 0.1

Sinfinite = a / (1 - r)
= 0.9 / (1 - 0.1)
= 0.9 / 0.9
= 1.

good job

by fatman123 Sun Jun 24, 2012 6:29 am

beatrixasdfghjk. wrote:a = 0.9
r = 0.1

Sinfinite = a / (1 - r)
= 0.9 / (1 - 0.1)
= 0.9 / 0.9
= 1.

that is not the formula i saw on wikipedia Mad

by beatrixasdfghjk. Sun Jun 24, 2012 6:40 am

fatman123 wrote:
beatrixasdfghjk. wrote:a = 0.9
r = 0.1

Sinfinite = a / (1 - r)
= 0.9 / (1 - 0.1)
= 0.9 / 0.9
= 1.

that is not the formula i saw on wikipedia

Well maybe if you did proper maths, rather than statistics Razz

.

by vizkosity Sun Jun 24, 2012 6:56 am

you can also do it informally like this (not sure if math profs will accept

0.9999... × 10 = 9.999999...

0.9999... × (9+1) = 9.999999... [by distribution rule:]

0.9999... × 9 + 0.99999.... × 1 = 9.99999....

0.9999... × 9 = 9.9999....-0.999999 = 9

0.9999... × 9 = 9

0.9999... = 1

by vizkosity Sun Jun 24, 2012 6:58 am

fatman123 wrote:
beatrixasdfghjk. wrote:a = 0.9
r = 0.1

Sinfinite = a / (1 - r)
= 0.9 / (1 - 0.1)
= 0.9 / 0.9
= 1.

that is not the formula i saw on wikipedia

Geometric series can turn into that formula after deriving it using the sigma sum symbol Razz

by fatman123 Sun Jun 24, 2012 7:01 am

beatrixasdfghjk. wrote:
fatman123 wrote:
beatrixasdfghjk. wrote:a = 0.9
r = 0.1

Sinfinite = a / (1 - r)
= 0.9 / (1 - 0.1)
= 0.9 / 0.9
= 1.

that is not the formula i saw on wikipedia
Well maybe if you did proper maths, rather than statistics .

statistics is proper maths

anyway next semester its going to be financial maths for me banana

by beatrixasdfghjk. Sun Jun 24, 2012 7:03 am

fatman123 wrote:
beatrixasdfghjk. wrote:
fatman123 wrote:
beatrixasdfghjk. wrote:a = 0.9
r = 0.1

Sinfinite = a / (1 - r)
= 0.9 / (1 - 0.1)
= 0.9 / 0.9
= 1.

that is not the formula i saw on wikipedia
Well maybe if you did proper maths, rather than statistics .

statistics is proper maths

anyway next semester its going to be financial maths for me

Quite curious as to how you integrate a Lorenz curve to obtain the Gini coefficient, actually Razz

.

by fatman123 Sun Jun 24, 2012 7:09 am

individualy speaking they dont seems like overly complex things but ive never been taught what intergration is so i have no idea what it is or how to do it, so know idea how id attack that

having said that they both seem much more like statisitcal tools then something strictly finance based but whatever, if i have to learn it ill figure it out somehow, i mean, i know at some point im going to have to teach myself stuff like integration

by beatrixasdfghjk. Sun Jun 24, 2012 7:10 am

fatman123 wrote:individualy speaking they dont seems like overly complex things but ive never been taught what intergration is so i have no idea what it is or how to do it, so know idea how id attack that

having said that they both seem much more like statisitcal tools then something strictly finance based but whatever, if i have to learn it ill figure it out somehow, i mean, i know at some point im going to have to teach myself stuff like integration

Why didn't you do it in school then T__TT.
Don't need all these makeup courses and stuff Razz

.

by vizkosity Sun Jun 24, 2012 7:11 am

i'm ignorant when it comes to stats :[

integration is simply "the sum of values". It's not what people generally believe in-area under the curve. Though that might help, but during the third/2nd year of math, they will flush that idea out of your head.

by fatman123 Sun Jun 24, 2012 7:13 am

i did general math, we learnt stuff like simple interest and what not

having said that the first page of my stats exam was all general math level probability, i smashed it and my friend who did 4u rekons he'd never seen any of it in his life and didnt even attempt it

by beatrixasdfghjk. Sun Jun 24, 2012 7:17 am

vizkosity wrote:i'm ignorant when it comes to stats :[

integration is simply "the sum of values". It's not what people generally believe in-area under the curve. Though that might help, but during the third/2nd year of math, they will flush that idea out of your head.

How do you integrate a Lorenz curve scratch

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by fatman123 Sun Jun 24, 2012 7:21 am

beatrixasdfghjk. wrote:
vizkosity wrote:i'm ignorant when it comes to stats :[

integration is simply "the sum of values". It's not what people generally believe in-area under the curve. Though that might help, but during the third/2nd year of math, they will flush that idea out of your head.
How do you integrate a Lorenz curve .

heres a better question: how do you know what a Lorenz curve and that coefficent thing are? theres no way thats part of HSC economics

by beatrixasdfghjk. Sun Jun 24, 2012 7:29 am

fatman123 wrote:
beatrixasdfghjk. wrote:
vizkosity wrote:i'm ignorant when it comes to stats :[

integration is simply "the sum of values". It's not what people generally believe in-area under the curve. Though that might help, but during the third/2nd year of math, they will flush that idea out of your head.
How do you integrate a Lorenz curve .

heres a better question: how do you know what a Lorenz curve and that coefficent thing are? theres no way thats part of HSC economics

Yes it is, what the hell are you talking about...
It's under income inequality, as well as the effects of globalisation and all that stuff.

by vizkosity Sun Jun 24, 2012 7:36 am

fatman123 wrote:
beatrixasdfghjk. wrote:
vizkosity wrote:i'm ignorant when it comes to stats :[

integration is simply "the sum of values". It's not what people generally believe in-area under the curve. Though that might help, but during the third/2nd year of math, they will flush that idea out of your head.
How do you integrate a Lorenz curve .

heres a better question: how do you know what a Lorenz curve and that coefficent thing are? theres no way thats part of HSC economics

i don't even know what Lorenz curve is lol...i thought it was Lorentz's math for some reason...and wiki is just too much to read for me atm

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