Probability: A box contains ten objects which consists of 1 red ball, 2 white balls, 3 red cubes and 4 white cubes. Three objects are selected randoml

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A box contains ten objects which consists of 1 red ball, 2 white balls, 3 red cubes and 4
white cubes. Three objects are selected randomly without replacement from the box.
The events A and B are defined as follows:
A : Exactly two of the objects drawn are balls
B : Exactly one of the objects drawn is red in colour
Show that P(A) = 7/40 and find P(B) and P(A n B).
 
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