Suppose there is a bag of 20 marbles. Of these marbles, 12 are green, 5 are blue, 2 are red, and 1 is black. What is the probability of drawing three marbles and having all
three be blue, without replacement?

Sherrie is baking a pie for her family. she leaves the room and comes back to 35% of the pie having been eaten before she can put the topping on. how much 1 square inch strips of dough will she need for the top, now that a portion is missing? round your answer to the nearest while nimber.