13. Can disjoint events be independent? 14. If two events A and B are independent, what must be true about A and B"? 15. What is meant by the union of two or more events? Draw a diagram. 16. State the addition rule for disjoint events. 17. What is meant by the intersection of two or more events? Draw a diagram. 18. Explain the difference between the union and the intersection of two or more events