My Math Forum Need help to edit my post.

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 March 19th, 2018, 11:25 PM #1 Member   Joined: Feb 2018 From: Canada Posts: 42 Thanks: 2 Need help to edit my post. Hi everyone, I am a new member. Can someone help me edit my post since I am a newbie so there is no edit button. Thank you.
 March 20th, 2018, 12:11 AM #2 Senior Member   Joined: Feb 2016 From: Australia Posts: 1,764 Thanks: 623 Math Focus: Yet to find out. There is an edit button, but it appears for a limited time only. 50% off your edit button! Come one come all, selling out sale, limited time available!
 March 20th, 2018, 12:18 AM #3 Senior Member     Joined: Nov 2010 From: Indonesia Posts: 2,001 Thanks: 132 Math Focus: Trigonometry Feels like a WinRar trial if you ask me...
March 20th, 2018, 01:18 AM   #4
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Quote:
 Originally Posted by Shanonhaliwell Can someone help me edit my post...
Hello Shannonhaliwell and welcome to MMF!

Provide a link to the post and instructions on what to edit and we'll make the changes for you.

Last edited by greg1313; March 21st, 2018 at 07:09 PM.

March 20th, 2018, 02:22 PM   #5
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Quote:
 Originally Posted by greg1313 Hello Shannonhaliwell and welcome to MMF! Provide a link to the post and instructions on what to edit and I'll make the changes for you.

The P.M.F. of Hypergeometric and Negative Binomial Distribution.

This is my post. I would like to make some changes in my solution. Please help me.
Thank you.

 March 20th, 2018, 03:59 PM #6 Global Moderator     Joined: Oct 2008 From: London, Ontario, Canada - The Forest City Posts: 7,912 Thanks: 1110 Math Focus: Elementary mathematics and beyond What changes would you like to make?
March 20th, 2018, 04:01 PM   #7
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Quote:
 Originally Posted by greg1313 What changes would you like to make?
The joint P.M.F. of X and Y is as following:
$$P_{X,Y}(x,y) = \begin{cases}0 &\text{if X=0 and Y is finite} \\ P(X=0)=\dfrac{\dbinom{20}{0}\dbinom{80}{30-0}}{\dbinom{100}{30}} &\text{if X=0 and Y is infinite} \\P_X(x)P_{Y/X}(y/x) = \dfrac{\dbinom{20}{x}\dbinom{80}{30-x}}{\dbinom{100}{30}} \dbinom{30-1}{4-1} 0.8^{30-4} 0.2^4 &\text{if }X=1,2,\dots ,20 \\ 0 &\text{ otherwise} \end{cases}$$

I might need to change in the future so it would be very helpful to have a permission to make my own changes. Thanks.

March 20th, 2018, 04:21 PM   #8
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Quote:
 Originally Posted by Shanonhaliwell ..I might need to change in the future so it would be very helpful to have a permission to make my own changes. Thanks.
As I understand it, everyone has the ability to edit their own posts for a certain time after the post is made. In general in a forum environment excessive editing is frowned on because you can seriously meddle with the context and content of a thread that way. Editing to get a post correct is fine and thus you get a limited time within which to perform it.

If you feel you truly need to correct a post, you can always just post again, noting that the new post is a correction.

Last edited by skipjack; March 20th, 2018 at 05:28 PM.

March 20th, 2018, 04:46 PM   #9
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Quote:
 Originally Posted by romsek as I understand it everyone has the ability to edit their own posts for a certain time after the post is made. In general in a forum environment excessive editing is frowned on because you can seriously meddle with the context and content of a thread that way. Editing to get a post correct is fine and thus you get a limited time within which to perform it.
Agree with all that Romsek.
BUT seems to me that while there is no 2nd post
(the original still there by itself)
then edits should be allowed;
cut off the edits when 2nd post is made.

 March 20th, 2018, 05:30 PM #10 Global Moderator   Joined: Dec 2006 Posts: 20,274 Thanks: 1959 I've done the edit for you, Shanonhaliwell. Thanks from greg1313 and Shanonhaliwell

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