book Maths Puzzle Numerical Ability

Hi, If I had a bag of marbles containing 5 green, 3 Blue and two red marbles. What is the probability of drawing the following marbles at random:

A red?
A red and then a green

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book Other Question
RE: permutations & combinations
(Bostock & Chandler "Pure Mathematics", Exercise 15e, question 12)

A box contains 10 bricks identical except for colour.
3 red, 2 white, 2 ye if f(x)+1-x2 and g(x)=1-x (F.g)(X)