Suppose you had a fish tank with 100 fish in it: 70 gold, 15 red, 13 black and 2 blue.

Further, suppose a very knotty color-blind kitty was fishing for lunch and he claws out random fish to eat. Calculate the probability that he claws out

a. one red fish or one blue fish

b. two fish: a black fish and then another black fish

c. three fish: and he does not claw a blue fish