Turn on thread page Beta
    • Thread Starter
    Offline

    10
    ReputationRep:
    Can i re-write n! as n(n-1)(n-2)! ?
    Offline

    11
    ReputationRep:
    No just try out a value for n.
    Such as n=4
    4!=24
    4(3)(2)!=24! Therefore they aren’t the same
    Posted on the TSR App. Download from Apple or Google Play
    • Thread Starter
    Offline

    10
    ReputationRep:
    (Original post by Howie_2114)
    No just try out a value for n.
    Such as n=4
    4!=24
    4(3)(2)!=24! Therefore they aren’t the same
    I mean the factorial is on the last one
    so it's 4x3x2!
    factorial applies to the last number
    Offline

    6
    ReputationRep:
    Yeah, provided n is greater than or equal to two
    • Thread Starter
    Offline

    10
    ReputationRep:
    Is it yes or no xD. oNE SAYS yes one says no. Can someone please confirm the answer?
    Offline

    15
    ReputationRep:
    (Original post by mariejuana)
    Is it yes or no xD. oNE SAYS yes one says no. Can someone please confirm the answer?
    Yes.

    n! = n(n-1)! = n(n-1)(n-2)! = n(n-1)(n-2)(n-3)! ... and so on
    Offline

    15
    ReputationRep:
    (Original post by Howie_2114)
    No just try out a value for n.
    Such as n=4
    4!=24
    4(3)(2)!=24! Therefore they aren’t the same
    4(3)(2)! is not the same as (4*3*2)!

    4(3)(2)! = 4*3*(2!) = 4*3*2 = 24
    • Thread Starter
    Offline

    10
    ReputationRep:
    (Original post by Maivnek)
    Yes.

    n! = n(n-1)! = n(n-1)(n-2)! = n(n-1)(n-2)(n-3)! ... and so on
    ok
    SO i have
    n(n-1)(n-2)!/ 2(n-2)!
    Would it be correct to simplify it like so
    n(n-1)!/2!
    and could this be further simplified ?
    Offline

    21
    ReputationRep:
    (Original post by mariejuana)
    ok
    SO i have
    n(n-1)(n-2)!/ 2(n-2)!
    Would it be correct to simplify it like so
    n(n-1)!/2!
    and could this be further simplified ?
    The exclamation marks cancel too.
    You're doing factorial of n-2 divided by factorial of n-2 so you should cancel out all of those extra terms.
    Offline

    15
    ReputationRep:
    (Original post by mariejuana)
    ok
    SO i have
    n(n-1)(n-2)!/ 2(n-2)!
    Would it be correct to simplify it like so
    n(n-1)!/2!
    and could this be further simplified ?
    EDIT: I completely misread, my bad

    This is not correct.
    Offline

    15
    ReputationRep:
    (Original post by mariejuana)
    ok
    SO i have
    n(n-1)(n-2)!/ 2(n-2)!
    Would it be correct to simplify it like so
    n(n-1)!/2!
    and could this be further simplified ?
    One factor is common to both the numerator and denominator, so it can be removed.
    n(n-1)(n-2)!/ 2(n-2)!

    and remember this is the same as:
    n(n-1)((n-2)!)/ 2((n-2)!)
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: February 20, 2018
The home of Results and Clearing

1,205

people online now

1,567,000

students helped last year

University open days

  1. SAE Institute
    Animation, Audio, Film, Games, Music, Business, Web Further education
    Thu, 16 Aug '18
  2. Bournemouth University
    Clearing Open Day Undergraduate
    Fri, 17 Aug '18
  3. University of Bolton
    Undergraduate Open Day Undergraduate
    Fri, 17 Aug '18
Poll
Do you want your parents to be with you when you collect your A-level results?
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

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.