Math brain teaser

<p>hahaha i totally fell for that…geez don’t i feel lame…of course its 4100 :)</p>

<p>doing these on the internet is too easy. Tell it to someone you know in person and tell them to answer fast without much thinking. Then it works very often.</p>

<p>4100…that should be right.</p>

<p>

rofl…</p>

<p>dude i bet you’d get tricked if it wasn’t written down…</p>

<p>anyway another one</p>

<p>your in a race. You just passed the 2nd place. what place are you in? FIRST CHOICE THAT COMES TO MIND</p>

<p>You’re now in 2nd place.</p>

<p>First place?</p>

<p>Also, I got the first one wrong. FFS >.<</p>

<p>

While I can understand why people might get confused, I still don’t see how it’s tricky.</p>

<p>I think it’s because most of us on CC are… “above average”, to put it one way. Without a doubt, the general population would get these wrong more often than the average CCer.</p>

<p>not true. It isn’t really how smart you are. Is how much attention you pay.</p>

<p>really the questions actually would be A LOT harder if they were told without any visual aid and you had to answer in 2 seconds.</p>

<p>lol i thought this would actually be a hard puzzle, this stuff is for the kindergarden</p>

<p>ohh you get 5000 if you say 90+10 to 1000 not 100, so I guess it is a teaser, seeing as CC people are getting confused about this xD</p>

<p>Actual teaser. (Though famous)</p>

<p>You are on a game show. There are three doors. Behind two of these is a goat, and behind the other is a convertible car. You get to keep whatever is behind the door you pick. All scenarios are equally likely. The game show host asks you to pick a door. After you do this, he opens up another door and shows you that there’s a goat behind it.</p>

<p>He then offers you an option - stick with the door you initially picked, or switch to the other closed door. Which do you do, and why?</p>

<p>switch because there’s a 2/3 chance.</p>

<p>Watch 21 much? or maybe read freakanomics lol. You switch your choice because the probability of you being right would increase from 33.3% to 66.6% lol. And how in god’s name do you get 5000? Please explain.</p>

<p>Before the last step (“Now add 10”) you are keeping a count of 4090. When you add the 10, you make the 9 a 0 and you carry the one. Some people (like myself) carried the 1 one more decimal place than they were supposed to, probably because 5000 sounds like a much nicer number than 4100.</p>

<p>How do you get 66.6%? I think you could choose either door, because one of the doors was already opened which showed the goat. That option is eliminated, so there are only two options left. One door has the convertible behind it and the other has the goat. There is a 50% chance with each option, so you could pick your original choice or the other door.</p>

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<p>The problem is much, much older than that. It’s usually known as the “Monte Hall” problem, and has been around for over a century.</p>

<p>If you are running in a marathon, and you pass second place, what place are you in?</p>

<p>2nd place, I would assume.</p>

<p>Try asking these to your friends on Facebook. The CC crowd is too sharp.</p>

<p>ElectricTech: the thing that the monte hall problem assumes is that the host knows which door has the prize (watch some “Lets make a deal” and you’ll see what I mean) he knows that the prize is behind one door so he deliberately doesn’t open that door. Because I’m too lazy to write it up here’s the wikipedia page on it [Monty</a> Hall problem - Wikipedia, the free encyclopedia](<a href=“http://en.wikipedia.org/wiki/Monte_Hall_Problem]Monty”>Monty Hall problem - Wikipedia) that should explain why.</p>