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random descrete variables, expectations please help

please help me.
QUESTION: A box contains 9 discs of which 4 are red, 3 are white and 2 are blue. Three discs are to be drawn at random without replacement from the box. Calculate;
a) the probability that the discs, in the order drawn, will be coloured red, white and blue respectively

b)the probability that one disc of each colour will be drawn.

c) the probability that the third disc drawn will be red

d) the probability that no red disc will be drawn.
e) the most probable number of red discs that will be drawn.
f) the expected number of red discs that will be drawn, and state the probability that this expected number of red discs will be drawn.
:confused: