My Math Forum  

Go Back   My Math Forum > High School Math Forum > Probability and Statistics

Probability and Statistics Basic Probability and Statistics Math Forum


Reply
 
LinkBack Thread Tools Display Modes
October 26th, 2016, 08:56 AM   #1
Newbie
 
Joined: Oct 2016
From: L√ľneburg

Posts: 2
Thanks: 0

Math Focus: eeem...Matrix
Lightbulb Preparation for exam in Probability.

Good evening Guys!
I am studying in Uni, in English, but my mother tongue isn't English. That's why I feel some problems with understanding probability. Needs your support and help.
After 5 weeks I will have an exam in probability.
I understood that to be good in this subjects after 7 weeks (module) not enough, that's why I would like that you tell me the direction of sets which we have in a tutorial. Coz smt I don't understand from where they took this formula or another.
Hope you don't mind. So... will ask you here many many times!

Last edited by Racconti; October 26th, 2016 at 09:07 AM.
Racconti is offline  
 
October 26th, 2016, 09:35 AM   #2
Newbie
 
Joined: Oct 2016
From: L√ľneburg

Posts: 2
Thanks: 0

Math Focus: eeem...Matrix
How many different linear arrangements are there of the letters A B C D E F for which:
a) A and B are next to each other?
b)A is before B?
c)A is before B and B is before C?
d)A is before B and C is before D?
e)A and B are next to each other and C and D are also next to each other?
f) E is not last in line?

well a) & b) i understood a)2!*5! = 240; b) 5! = 120
BUT
c) many answers in net that6!/3!...why?
I thought it's 4! (=24). coz nobody said that they are NEXT to each other, we have construction ABC. And as I understood it's look like
A B C * * *
* A B C * *
* * A B C *
* * * A B C
No?

the same idea for me with e)

and f) 5! = 120 - it's clear

P.S. can you eplain but VERY EASY! thank you
Racconti is offline  
Reply

  My Math Forum > High School Math Forum > Probability and Statistics

Tags
exam, preparation, probability



Search tags for this page
Click on a term to search for related topics.
Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Question re probability of explanation of Exam procedure Stuart B W Advanced Statistics 1 July 10th, 2015 03:43 AM
Probability of different explanations for exam paper Stuart B W Probability and Statistics 6 July 9th, 2015 08:34 AM
Conditional Probability Old Exam Question uberjason7 Probability and Statistics 0 May 24th, 2013 05:56 AM
Probability of passing the network exam pksinghal Probability and Statistics 2 October 31st, 2010 09:52 AM
Probability - same answer 4-in-a-row on multiple choice exam ahhaaa Probability and Statistics 1 May 18th, 2010 04:23 PM





Copyright © 2019 My Math Forum. All rights reserved.