Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    12
    ReputationRep:
    Can I have some help with question 7 on the June 2010 paper? I understand how to do part (i) but not (ii) or (iii).
    • Thread Starter
    Offline

    12
    ReputationRep:
    Name:  WhatsApp Image 2017-02-11 at 11.03.17.jpeg
Views: 40
Size:  57.0 KB
    Offline

    3
    ReputationRep:
    For part (ii), how many possible combinations are there involving boiled rice? Let  \mathbf{A} be the event that they have boiled rice. Then,

     \displaystyle \mathbb{P}\left(\mathbf{A}\right  ) = \frac{\text{ number of combinations involving boiled rice}}{\text{all possible combinations, so part (i)}}

    For part (iii), they can either choose boiled rice or not. You have two situations:

    Situation B: they don't choose boiled rice. How many possible rice combinations do they have now? What about the total number of dish combinations?

    Situation C: they have boiled rice. This means they only have one more rice choice of the remaining three. It also means they cannot choose potatoes, so how many possible vegetable dish combinations do they have now? What about the total number of dish combinations?

    Let me know if you need anymore help
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Will you be richer or poorer than your parents?
    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
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • 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

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