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Math Help - Need help with IGCSE Probability problem

  1. #1
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    Question Need help with IGCSE Probability problem

    I've done this one, but the answers in the book are different. Just checking if I'm right.

    Q. A box contains 3 red discs and 4 blue discs. Two discs are to be selected together, at random. Find the probability that they will be
    a) of the same colour
    b) of different colour

    Please show all your working clearly, and state the names of the rules you are using (like the and or or rule). Thanks for the help!
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  2. #2
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    Re: Need help with IGCSE Probability problem

    Quote Originally Posted by fbarawr View Post
    Q. A box contains 3 red discs and 4 blue discs. Two discs are to be selected together, at random. Find the probability that they will be
    a) of the same colour
    b) of different colour

    Please show all your working clearly, and state the names of the rules you are using (like the and or or rule).
    Is that a demand? An order?
    Why don't you post your work so we have some idea how to help?
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  3. #3
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    Smile Re: Need help with IGCSE Probability problem

    Quote Originally Posted by Plato View Post
    Is that a demand? An order?
    Why don't you post your work so we have some idea how to help?
    No that's not a demand or an order, it's simply something I require in the answer. I haven't posted my work because I find no need to do so; you can help by doing the sum for me. I don't see how posting my work would help.
    On a different note, your tone is kind of rude. If you don't feel like helping, don't help. I'm sure others will, and if you want to help, please be nice. Thanks!
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