Answer:
2/9
Explanation:
Possible outcomes: olives, olives and guacamole, olives and chicken, guacamole, guacamole and olives, guacamole and chicken, chicken, chicken and olives, chicken and guacamole = 9 possible outcomes
way to achieve just black olives and guacamole = 2
possibility is 2 over 9 = 2/9