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Math Help - Combinations

  1. #1
    Newbie
    Joined
    Nov 2012
    From
    UK
    Posts
    1

    Combinations

    Just some questions I'd like confirmation on thanks!

    1. A group of nine children visit Santa’s grotto. Three of the children
    are two years of age and the remaining six are three. Santa has a
    sack that contains twenty wrapped presents. Twelve of these are
    suitable for children of all ages. The other eight are only suitable
    for children older than two. Santa draws one present at random
    from his sack for every child.
    (a) What is the probability that all three of the two-year olds get
    presents that are suitable for their age group?
    [5 marks]
    (b) Given that all children got presents that are suitable for their
    age group, what is the probability that all of the three-year
    olds got presents that are suitable for children older than two?
    [6 marks]
    (c) What is the probability that all of the children get presents
    that are suitable for all ages?
    [6 marks]
    (d) What is the probability that exactly six of the nine children
    received presents that are suitable for all ages?
    [6 marks]
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  2. #2
    Newbie
    Joined
    Nov 2012
    From
    nagercoil
    Posts
    11

    Re: Combinations

    How many different combinations can I make with these numbers?




    bar stool
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