Question 12
A box contains 8 red, 9 yellow and 10 blue marbles. Without looking, what is the minimum number Bob must draw to guarantee (a) at least one blue marble; (b) at least two yellow marbles; (c) at least two marbles of the same colour? Enter (a); (b); (c).
Draw without replacement and keep all drawn marbles. Each subpart starts with the full original box.
Draw without replacement and keep all drawn marbles. Each subpart starts with the full original box.