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October 26th, 2016, 08:56 AM  #1 
Newbie Joined: Oct 2016 From: Lüneburg Posts: 2 Thanks: 0 Math Focus: eeem...Matrix  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. 
October 26th, 2016, 09:35 AM  #2 
Newbie Joined: Oct 2016 From: Lüneburg 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 

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