A bag has 4 red and 2 yellow marbles. Behnaz draws two without replacement.

(a(i)) Find the probability both are red. [2]

(a(ii)) Find the probability they are not both red. [1]

(b) A second bag has 5 blue and 2 green marbles. Bryn draws without replacement until getting a green marble. Find the probability of getting green on the first, second or third attempt. [4]