If the number of defective items selected at random from a parts inventory is considered to follow a binomial distribution with n = 50 and p = 0.15, the standard deviation of the number of defective parts is: Three events occur with probabilities P(E1) = 0.35, P(E2) = 0.15, P(E3) = 0.45. If the event B occurs, the probability becomes P(E1|B) = 0.25, P(B) = 0.30. Assume that E1, E2, and E3 are independent events. Calculate P(E1 and E2 and E3).