[Archive!] Pure mathematics, physics, chemistry, etc.: brain-training problems not related to trade in any way - page 329

 
alsu писал(а) >>
Attached is a solution with a figure. if you are interested, look, cut, check:))


I never would have guessed it :))
 

My guess is that something divided by zero is the biggest number :))

 
And I've seen another solution, but without an explanation.
Link: http://dirty.ru/comments/271498/

There seem to be even two solutions, the second one is lower, but some kind of different one.
By the way, Wittgenstein's problem is also from there.

Another one from hubrahabr:
An electronic scoreboard displays a correct mathematical equality. But one pixel of the scoreboard is defective. Which one?

http://habrahabr.ru/blogs/zadachki/
 
Mathemat писал(а) >>

The electronic scoreboard displays the correct mathematical equation. But one pixel on the scoreboard is faulty. >> Which one?

It's a tricky one. It's not the pixel that's faulty, it's the transistor that powers it. And the number 71 is also muddying the waters. That's a good psychology problem.

 
alsu >>:
в аттаче решение с фигурой. кому интересно, смотрим, вырезаем, проверяем:))

wow, super!

even if there are some superfractal flat solutions, they all rest.

truly beautiful.

 
And I solved the scoreboard problem - it's really only one pixel!
Richie, trust me: there's no psychology there.
 
Mathemat >>:
А я решил задачку с табло - ведь и правда всего один пиксел!
Richie, поверь мне: никакой психологии там нет.

Yeah. The problem can be solved in a straightforward way: check everything slowly and you'll see - here's the answer:)))) but if the ones had tails, it wouldn't work...

 
alsu >>:

ага. задача в принципе решается в лоб: проверяй потихоньку все подряд и глядишь - вот он и ответ:))) а вот будь у единичек хвостики - и ничего бы не вышло...

!=)

// I'm watching a movie on yesterday's tip, about chaos. It's a great film, everybody watch.

//( bbc: The Secret Life of Chaos)

// the link is unverified. i used the other one, the slow one.

 
A bit off-topic. I'm kind of confused about a simple problem here.

Given a pdf of some random variable X and a pdf of a random variable Z=X+Y. It is known that the variables X and Y are dependent. Find the conditional pdf of Y|X.

Off topic, as the problem is actually directly related to trading:))
 
MetaDriver >>:

!=)

// Я тут кино смотрю по вчерашней наводке, про хаос. классный фильм, всем смотреть.

// (BBC: Тайная жизнь хаоса / BBC: The Secret Life of Chaos)

// ссылка не проверенная. я по другой скачивал, по медленной

there is a torrent http://rutracker.org/forum/viewtopic.php?t=2690789

Reason: