Brain Teasers
Brain Teasers Trivia Mentalrobics Games Community
Personal Links
Submit a Teaser
Your Favorites
Your Watchlist
Browse Teasers
All

Cryptography
Group
Language
Letter-Equations
Logic
Logic-Grid
Math
Mystery
Optical-Illusions
Other
Probability
Rebus
Riddle
Science
Series
Situation
Trick
Trivia

Random
Daily Teasers
Search Teasers

Advanced Search
Add to Google Add to del.icio.us

More ways to get Braingle...

Cheap 'n' Nasty MP3 Player

Probability puzzles require you to weigh all the possibilities and pick the most likely outcome.

 

Puzzle ID:#20784
Fun:*** (2.61)
Difficulty:*** (2.21)
Category:Probability
Submitted By:pi202****
Corrected By:Winner4600

 

 

 



My MP3 player is cheap 'n' nasty and has now broken: it is stuck on 'Shuffle'. In this mode it starts with whatever track you put it on, but then plays tracks in a random order. The only restriction is it never plays a song that's already been played that day.

I purchased my favourite murder mystery book in audio format, and put the first 6 chapters on my MP3 player. (Each chapter is exactly 1 track.) There's nothing else on my player at the moment. What is the probability that I will hear the 6 chapters in order as I listen today, without having to change tracks at all? (Obviously, I will ensure it plays chapter 1 first.)

The next day I empty the player before putting on the next 6 chapters. This time I also transfer a CD of mine with 11 songs on. I don't mind songs coming in between the chapters of my book, as long as the chapters are in order. What's the probability of that happening now?




What Next?

  
  

See another brain teaser just like this one...

Or, just get a random brain teaser

If you become a registered user you can vote on this brain teaser, keep track of
which ones you have seen, and even make your own.

 



Comments

sweetpeao4o3**
Feb 02, 2005

umm
sweetpeao4o3**
Feb 02, 2005

that was weird
AtropusAnz*
Feb 02, 2005

Wow - I failed statistics at high school but I got this one easily.. Thanks for the cool teaser ^_^
mizgolf13*us
Feb 03, 2005

all righty then....
Jon0513Aus*
Feb 05, 2005

where did u get 1/5= 1/120?
pi202**
Feb 05, 2005

john: 5! (five factorial) means 5x4x3x2x1 which equals 120. That's how 1/5!=1/120.
(user deleted)
Feb 09, 2005

Math Wizard.... Way to go!!
MrBasKetBall**
Feb 13, 2005

Too easy.
munchtipq
Mar 18, 2005

Argggh! I ALWAYS get taken in by these and go through all the math of calculating the probability only to get the same answer! I like it when that happens, though. Good one
lilwes2005**
Apr 16, 2005

that was a nice easy teaser thx i got the right answer
brianz**
Apr 30, 2005

I got the first half but can't believe I missed the second half.
BrownEyesAus*
May 03, 2005

Woah!
bigSWAFF_69_Aus*
May 20, 2005

my shuffle on my CD player is a lot more un-complex (is that a word?) You can program how ever many tracks you want to skip. Any way, good job.
Yoyobug02**
Jun 04, 2005

Kinda hard i had to think about it but i finally got it good job!
Beo921
Jun 14, 2005

Good job. I like that you added the second part. I had to think about it more...
slat490*
Jun 20, 2005

Do u have an iPod suffle, cause i do and it dose the same thing only the battery dies ultra fast too.
naughtyangel*
Jul 01, 2005

fun
emcruiserchik*
Jul 06, 2005

I kept looking for some trick in it and ended up with a headache briiliant!
Desert660
Jul 28, 2005

Dude ow do you do that????AneWayz cool
kickthecan**
Dec 16, 2005

Cool
sugarnspice4u7*us*
Dec 23, 2005

you spelled favorite wrong.
oh well- good teaser!
blackmarket69**
Feb 22, 2006

um.......ok?
pi202**
Feb 23, 2006

Sugarnspice: I'm English. I spelt favourite perfectly thank you very much.
Jimbo*au*
Feb 27, 2006

Firstly I'm not English but I can spell "favourite" so I guess that makes you the odd man out sugar (sic). Secondly, I loved the second part - nice twist!. Thirdly there was just one bit that wasn't clear in the wording. If you listen to the chapters shuffling all day then on one of the many random passes the 5 chapters might be in order. The answer implies that the 5 chapters are played just once. Threw me a bit!
pi202**
Feb 27, 2006

Fair enough jimbo - I hadn't thought of your third point. The wording is a little ambiguous I admit.
Jimbo*au*
Mar 01, 2006

My apologies Pi. It does say that it never plays a song that has already been played that day so that's my mistake. Good puzzle!
buenos*us*
May 09, 2006

whoops... didn't read that you select the first one so I got 1/720 for both
FatHeadAus*
Apr 06, 2007

I hear you Munch. But all the more reason to give it a full Star!



Back to Top
   



Users in Chat : sciencesteven 

Online Now: 11 users and 489 guests

Copyright © 1999-2014 | Updates | FAQ | RSS | Widgets | Links | Green | Subscribe | Contact | Privacy | Conditions | Advertise

Custom Search





Sign In A Create a free account