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Mathematics: Post your doubts here!

Discussion in 'International A And AS Level' started by XPFMember, Sep 8, 2011.

  1. Muhammad Talha

    Muhammad Talha

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    1357913579 thanx alot....=)
     
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  3. Muhammad Talha

    Muhammad Talha

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    Same here....
     
  4. Muhammad Talha

    Muhammad Talha

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    Solve thz Identity:

    ( 1/sinx - 1/tanx )^2 = 1-cosx/1+cosx
     
  5. 1357913579

    1357913579

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    are you giving statistics in this november
     
  6. Silent Hunter

    Silent Hunter

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  7. Muhammad Talha

    Muhammad Talha

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    me?
     
  8. sagystu

    sagystu

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  9. Silent Hunter

    Silent Hunter

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    well if ur asking from me............i am not giving the paper of stats ... AS maths + stats in 2012 june........

    NEED HELP IN PERMUTATIONS AND COMBINATIONS!!!!
     
  10. XPFMember

    XPFMember XPC Moderator Staff Member

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    Assalamoalaikum!!

    For permutations and combinations watch this whole series of the tutorial, and you're good to go! ;) http://www.examsolutions.co.uk/maths-re ... rial-1.php


    I see people finding permutations and combinations hard, but honestly i enjoy it a lot..

    And one more thing, (you may understand this better may be after you've gone through the topic, but anyways)
    to make out when you have to use permutation (nPr of the calculator) and when to use combinations (nCr) , checck if the different arrangements of the selections will make any difference or not...if it does then you've to use nPr, and if it doesn't then u must use nCr.

    Eg. lets say I want to choose two numbers from a total of three..how many possible selections are there?

    now see i may choose 1 2 ; 1 3 ; 2 3
    now the no. i've chosen can be written as 2 1 ; 3 1 ; 3 2

    and obviously, this is giving me different numbers, so here arrangement does matter..so go for nPr => 3P2 = 6

    but say if i got to chose 2 people from a total of 3 (A, B and C)

    so possibilities are A B ; A C ; B/ C
    and if i make this as B A ; C A ; C B
    it doesn't make any difference as in the end there are the same people whether A first or B first....so that means arrangement does not matter...we'll use nCr => 3C2 = 3

    P.S. These were pretty simple examples, I used them to explain the concept...you'll find this part of my explanation helpful when later on you tackle some more harder situations...this part really makes this thing easy...it did for me ;)
     
  11. nikhil000

    nikhil000

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    Anyone out there ..Plz help me!
     
  12. XPFMember

    XPFMember XPC Moderator Staff Member

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    Assalamoalaikum..


    Check this:
     

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  13. sagystu

    sagystu

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  14. NehaKush

    NehaKush

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    which question?
     
  15. NehaKush

    NehaKush

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    i nid notes on vectors paper3.. thnx
     
  16. mrpaudel

    mrpaudel

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    I hope this will help...!! but a bit messy...sorry for that..!!
     

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  17. IgoforA

    IgoforA

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    part 2 question... please help and i wanna know how to separate tan 4X??
     

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  18. mrpaudel

    mrpaudel

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  19. XPFMember

    XPFMember XPC Moderator Staff Member

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  20. mrpaudel

    mrpaudel

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    m lazy one..so wrote it in degree...u have to write it in radian from the very first...!! i think u know it....anyways..!! i hope it helped..!!
     
  21. mrpaudel

    mrpaudel

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