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Today, 10:41

MarkFL started a thread Problem Of The Week #311 Apr 26th, 2018 in POTW for Secondary School/High School Students

Here is this week's POTW: A charge $-q_1$ is located at the origin of a $y$-axis and a charge $-q_2$ is located at $y=d$. At what point along...

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0 replies | 9 view(s)
Today, 10:40

MarkFL replied to a thread Problem Of The Week #310 Apr 20th, 2018 in POTW for Secondary School/High School Students

Congratulations to the following members for their correct submission: kaliprasad My solution is as follows: For the entire system...

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1 replies | 50 view(s)
Yesterday, 15:42

MarkFL replied to a thread Construct the 99% confidence interval estimate in Basic Probability and Statistics

Hello and welcome to MHB! :D We ask that our users show their progress (work thus far or thoughts on how to begin) when posting questions. This...

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1 replies | 59 view(s)
April 22nd, 2018, 10:17

MarkFL replied to a thread Olinguito in Introductions

Hello, and welcome to MHB! (Wave)

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8 replies | 106 view(s)
April 21st, 2018, 14:15

MarkFL replied to a thread Error 502, bad gateway in Questions, Comments, and Feedback

There was no inconvenience, except to you trying to post and to those trying to read the thread. It was bad coding on my part, done before I knew the...

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19 replies | 522 view(s)
April 20th, 2018, 22:16

MarkFL replied to a thread BBCode For Username HTML Markup in vBulletin Products

Update - Version 1.3.1: Bug fix for usernames with special characters.

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2 replies | 224 view(s)
April 20th, 2018, 19:16

MarkFL replied to a thread Error 502, bad gateway in Questions, Comments, and Feedback

I have added code to that external script so a single quote in a username won't throw an error, and I edited the post so that only the username is...

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19 replies | 522 view(s)
April 20th, 2018, 12:00

MarkFL started a thread Problem Of The Week #310 Apr 20th, 2018 in POTW for Secondary School/High School Students

Here is this week's POTW: A small bug is placed between two blocks of masses $m_1$ and $m_2$ ($m_1>m_2$) on a frictionless table. A horizontal...

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1 replies | 50 view(s)
April 20th, 2018, 11:59

MarkFL replied to a thread Problem Of The Week #309 Apr 12th, 2018 in POTW for Secondary School/High School Students

No one answered this week's problem, and my solution is as follows: A formula for power $P$ we can apply here is: P=\frac{1}{2}\mu\omega^2A^2v...

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1 replies | 75 view(s)
April 15th, 2018, 20:01

MarkFL replied to a thread A Difficult Partial Sum in Pre-Calculus

Awesome work, as always Chris! (Yes) Using your post, where the base case and induction statement have been given, then the induction step would...

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6 replies | 133 view(s)
April 15th, 2018, 12:02

MarkFL replied to a thread A Difficult Partial Sum in Pre-Calculus

Here are the choices: A.) \frac{1}{2} B.) \frac{1}{2}-\frac{2^{2006}}{3^{2^{2006}}-1} C.) \frac{1}{2}-\frac{2^{2005}}{3^{2^{2005}}-1} D.)...

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6 replies | 133 view(s)
April 14th, 2018, 10:56

MarkFL replied to a thread A Difficult Partial Sum in Pre-Calculus

The actual sum he's given is: S=\sum_{k=0}^{2006}\left(\frac{2^k}{3^{2^k}+1}\right) And he's given several choices for the result. I was hoping...

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6 replies | 133 view(s)
April 14th, 2018, 10:10

MarkFL started a thread A Difficult Partial Sum in Pre-Calculus

Hello MHB! (Wave) A young man in high school I know has been essentially tasked with finding the following partial sum: ...

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6 replies | 133 view(s)
April 12th, 2018, 11:47

MarkFL replied to a thread Hello from Pan in Introductions

Hello, and welcome to MHB panpan! (Wave)

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6 replies | 94 view(s)
April 12th, 2018, 11:15

MarkFL started a thread Problem Of The Week #309 Apr 12th, 2018 in POTW for Secondary School/High School Students

Hello, MHB Community! (Wave) anemone has asked me to stand in for her for a few weeks, so please be gentle. (Bigsmile) Here is this week's...

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1 replies | 75 view(s)
April 12th, 2018, 11:11

MarkFL replied to a thread Problem Of The Week #308 Apr 6th, 2018 in POTW for Secondary School/High School Students

Hello MHB Community! (Wave) I am going to stand in for anemone for a few weeks. Congratulations to the following for their correct submissions:...

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1 replies | 136 view(s)
April 9th, 2018, 21:16

MarkFL replied to a thread Deduction in Discrete Mathematics, Set Theory, and Logic

Yes, that was a bad post. The OP stated an unfamiliarity with limits, so I "winged it." What I would actually do is: ...

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7 replies | 109 view(s)
April 9th, 2018, 15:05

MarkFL replied to a thread Deduction in Discrete Mathematics, Set Theory, and Logic

I would write: ...

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7 replies | 109 view(s)
April 9th, 2018, 14:47

MarkFL replied to a thread Deduction in Discrete Mathematics, Set Theory, and Logic

Take a look at what I posted for the $n$th sum of this same series, and see if you can't change in over to an infinite sum...

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7 replies | 109 view(s)
April 9th, 2018, 14:34

MarkFL replied to a thread Geometric Series in Discrete Mathematics, Set Theory, and Logic

Okay, then the formula you first cited works in this case: S_{\infty}=\sum_{k=0}^{\infty}a_n=\frac{a}{1-r} It is my understanding your sum is:...

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8 replies | 111 view(s)
April 9th, 2018, 14:23

MarkFL replied to a thread Induction in Discrete Mathematics, Set Theory, and Logic

To properly use bracketing, you want: Sn = 1 + 1/(n+1) I would highly recommend learning to use $\LaTeX$ to make your expressions more...

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4 replies | 67 view(s)
April 9th, 2018, 14:10

MarkFL replied to a thread Geometric Series in Discrete Mathematics, Set Theory, and Logic

Have you worked with limits before?

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8 replies | 111 view(s)
April 9th, 2018, 14:07

MarkFL replied to a thread Induction in Discrete Mathematics, Set Theory, and Logic

What they want you to do is: ...

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4 replies | 67 view(s)
April 9th, 2018, 13:50

MarkFL replied to a thread Geometric Series in Discrete Mathematics, Set Theory, and Logic

What you can do is: S_{\infty}=\lim_{n\to\infty}S_n

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8 replies | 111 view(s)
April 9th, 2018, 11:38

MarkFL replied to a thread Geometric Series in Discrete Mathematics, Set Theory, and Logic

As far as this problem goes, it is done, because we have shown the ratio is a constant. :)

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10 replies | 152 view(s)
April 9th, 2018, 11:19

MarkFL replied to a thread Geometric Series in Discrete Mathematics, Set Theory, and Logic

No, I think you are not using proper rules of algebra. Observe that: a_{n+1}=\frac{18}{3^{n+1}}=\frac{18}{3\cdot3^n}=\frac{1}{3}a_n Hence: ...

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10 replies | 152 view(s)

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We are an online community that gives free mathematics help any time of the day about any problem, no matter what the level. You will have to register before you can post. To start viewing messages, select the forum that you want to visit from the selection below.

MarkFL Pessimist Singularitarian MHB AdministratorMHB CoderMHB Math HelperMHB Ambassador

Mini Statistics

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Visitor Messages

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April 26th, 2018

April 25th, 2018

April 24th, 2018

MarkFL

Pessimist Singularitarian

MHB Administrator
MHB Coder
MHB Math Helper
MHB Ambassador