Suppose you have a set S of 40 objects, split into four classes (C1, C2, C3, and C4) of 10 objects each. Objects within a class are identical. • You pick one object from S at random. What is the probability that the object belongs to the class C4? • You pick three objects at random, one at a time, with replacement. What is the probability that all three belong to the class C4? • You pick three objects at random, one at a time, without replacement. What is the probability that all three belong to the class C1?

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