For three events, say, A, B, and C, the general multiplication rule is P(A & B &

Question:

For three events, say, A, B, and C, the general multiplication rule is
P(A & B & C) = P(A) · P(B | A) · P(C | (A & B)).
a. Suppose that three cards are randomly selected without replacement from an ordinary deck of 52 cards. Find the probability that all three cards are hearts; the first two cards are hearts and the third is a spade.
b. State the general multiplication rule for four events.