題組內容

(c) The Graduate Management Admission Test (GMAT) is a requirement for all applicants of MBA programs. There are a variety of preparatory courses designed to help improve GMAT scores. Let A1 be the event that an applicant gets GMAT score 650 or more, be the event that llie applicant gets GMAT score less than 650，and B be the event that the applicant take preparatory course. Suppose

(i) Are A1 and A2 mutually exclusive? (2%)