oh well, i realise my mistake now. I didnt even bother trying to work it out mathematically. At least it was only one mark. Do they give out half marks in the hsc?
Ah shit...just realised I was doing it properly, but using the Blue and the white instead of the red and the white...
I can now calm down!!! LOL
Good luck all!
Having a bit of trouble with this question. Can someone tell me how I do this one?
'A bag contains five blue marbles, siz red marbles and four white marbles. Marbles are drawn, one at a time without replacement, from the bag.
What is the probibility that of the first two marbles drawn one...