Turn on thread page Beta

Statistics permutations/combinations question watch

Announcements
    • Thread Starter
    Offline

    0
    ReputationRep:
    Please could you help me on this question, my mind has just gone completely blank.

    A disc jockey has 12 tracks to play during an hour programme. He has unfortunately forgotten to bring the playlist giving the order of the tracks. He decides to play them in a random order, playing each track once.

    What is the probability he plays the tracks in the correct order once.

    Is the answer 12! and he has a 1 in 12! chance?
    • Study Helper
    Offline

    15
    Study Helper
    (Original post by 36CrazyfistsFay)
    Please could you help me on this question, my mind has just gone completely blank.

    A disc jockey has 12 tracks to play during an hour programme. He has unfortunately forgotten to bring the playlist giving the order of the tracks. He decides to play them in a random order, playing each track once.

    What is the probability he plays the tracks in the correct order once.

    Is the answer 12! and he has a 1 in 12! chance?
    That's correct. You just need to state the probability rather than chances.

    12 records. 12! possible orderings.

    Since he only plays them once, probabilty of getting it correct is 1/12!
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: May 13, 2014

University open days

  • University of East Anglia
    All Departments Open 13:00-17:00. Find out more about our diverse range of subject areas and career progression in the Arts & Humanities, Social Sciences, Medicine & Health Sciences, and the Sciences. Postgraduate
    Wed, 30 Jan '19
  • Aston University
    Postgraduate Open Day Postgraduate
    Wed, 30 Jan '19
  • Solent University
    Careers in maritime Undergraduate
    Sat, 2 Feb '19
Poll
Brexit: Given the chance now, would you vote leave or remain?
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

Equations

How to use LaTex

Writing equations the easy way

Equations

Best calculators for A level Maths

Tips on which model to get

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.