The Math Thread

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The Math Thread

Postby lordpat » December 11th, 2014, 3:48 pm

Seeing how a lot of people in this forum like Math, I thought "why not making a math thread?" And here it is!




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Weather you need help or have a question, or want to show something cool, or want to post a math puzzle, or anything your imagine. And no, I am not coming with a math pun.


Ok, fine. If you ever wondered why, just calculate y, and if you wonder again, calculate x (or z)!
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Re: The Math Thread

Postby l.m » December 12th, 2014, 3:34 am

NAN




IT'S TIME
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Re: The Math Thread

Postby Konradix » December 12th, 2014, 4:40 am

Aka the thread Nan hates. Add that to the subtitle :P
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Re: The Math Thread

Postby NanTheDark » December 12th, 2014, 5:27 am

You should have made this thread sooner. I'm gonna face my fate in... *looks at wristwatch* 20 minutes. -_-

This thread will probably come in handy to other peoples though.

Also, now that I see you guys directly reference me like this, I feel like I'm popular. :3
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Re: The Math Thread

Postby l.m » December 12th, 2014, 6:33 am

when i remember about math i think of nan

so nan is popular now, because he hates math
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Re: The Math Thread

Postby lordpat » December 12th, 2014, 7:03 am

Best of luck Nan!

So I thought I might start with a puzzle that is not very hard (just for a warm up), but it is pretty intresting, showing that probability really is something counterintuitive.

Girl or boy?
In a two-child family, one child is a boy. What is the probability that the other child is a girl? What if the older child is a boy?

EDIT: Oh, credit: mathforum.org

A very simple puzzle that, at least to me, is very intresting. It reminds me to the Monty Hall problem.
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Re: The Math Thread

Postby Supershroom » December 12th, 2014, 7:18 am

*Thumbs up to this topic* ...

... but this one is too easy. The probability for a girl or a boy stays the same no matter which sex any previous child has. Here's a slightly harder one:

Be sure not to bet too much. I show you three cards, one has two black sides, another has two red sides, and the third has both one black side and one red side. I put the cards under a hat, take one out randomly (or better: let you take one out) so that only the front side is visible, and then I bet 10 bucks that the back side has the same colour as the front side. How many bucks shall you hold up to let this be a fair bet?

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A mathematician has found a wonderful proof and wants to hang it up as a picture on the wall. Sadly there's no one else present so he has to nail it on his own. He holds the nail with its head pointing to the wall. Before he wants to hit it, he looks at it, and stops short. He thinks ... and thinks ... after five minutes he comes to the conclusion:

This is a nail for the opposite wall.
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2 stars: (6 - 9.75) These levels are not terrible, but poor. They're too short, lack scenery or they have errors and/or bugs but it's still barely enjoyable. Again, spend more effort and try to do better. (if it's your first level that I rate two stars, it's not bad. There's a long way you can still go)

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Re: The Math Thread

Postby Konradix » December 12th, 2014, 7:55 am

20/3 bucks
"Men cry not for themselves, but for their comrades"

Check out my newest level called:
Image
Be sure to leave a comment and a rating ;)
Fun and Games: show
Levels that I may make by 20XX
- Remake of Airship Armada
- Level using the Turbo FLUDD
- Level using the Flying Cap
- A level on the moon

- Syzygy Labs
- Maybe some sort of Metroidvania level
- Sneaking level
- A mystery


Random Stuff
Image
Image
Czasoprzestrzen/Spacetime... If only somebody knew this hidden gem...

Huh?
GENERATION 31: The first time you see this, copy it into your sig on any forum and add 1 to the generation. Social experiment.
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Re: The Math Thread

Postby Supershroom » December 12th, 2014, 7:57 am

Maybe you have the right idea, but I strongly believe this is incorrect

One more try.
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Thank you, FF.

Nan's sig! From the previous Secret Santa event!: show
Rating standards: show
1 star: (0 - 5.75 in LDC) These levels need a lot of work. They're totally un-elaborated, and/or inherently flawed due to things like cutoff or enemy spam, or they're untested and there are too many bugs gameplay-wise, in short: Many many things went wrong in such a level.

2 stars: (6 - 9.75) These levels are not terrible, but poor. They're too short, lack scenery or they have errors and/or bugs but it's still barely enjoyable. Again, spend more effort and try to do better. (if it's your first level that I rate two stars, it's not bad. There's a long way you can still go)

3 stars: (10 - 12.75) These levels are about mediocre. They may be still a little bit short, the gameplay is fine but not very original and graphics are also solid, but not breath-taking. Try to keep improving!

4 stars: (13 - 15) These levels are nice, but not the best. Effort has been put into them, there can some professionality be seen in gameplay and graphics, they're a nice experience to play, but there are still things you can do to make it even better. Try to go the extra mile!

5 stars: (15.25 - 20) These are really great levels, those which, as said, I would give more than 15 in an LDC. These suffice many high requirements, and it already goes into subtleties if you want to make them better. These levels are successful all around. Bravo.

These are just general principles I try to follow when rating. Sometimes I don't leave a further comment when rating, most times I do, if you have questions about it, feel free to ask further.
Look at this!: show
My total SM63 level experience: 2803 levels.
Total coins collected in these: 306800

The WITBLO11 Tribute


A showcase of the 25 best levels of 2011, including such fantastic levels as Niveau Victorieux Galaxy, Plastic Beach, Dimension Infinity, Realm of the Heavens/Parallel Spires, and more!

My Level Collection: http://runouw.com/forums/viewtopic.php?f=25&t=47186

Other Important Links:
Last Legacy Level Designer tutorial
Eternal SM63 Medal Table
Eternal SM63 Score Table (all LDC scores available)
Top 10 Lists for LDC's (highest averages in a single judging criterion)
Runouw Votes Eternal Table
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Re: The Math Thread

Postby lordpat » December 12th, 2014, 8:01 am

It does affect, Shroom. Try putting it up as a traditional probability problem. The answer may surprise you.
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Thanks FF for this sig!

Credit to Bam/Bryce for the halloween avatar!
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