Prejudice is a kind of preconceived and preconceived ideas and attitudes that lack an objective basis. In social psychology, prejudice often refers to negative and rejective attitudes. Discrimination refers to not based on ability, contribution, cooperation, etc Instead, it treats members of society differently based on their statuses such as identity, gender, ethnicity, or socioeconomic resources. Based on the above definitions, Which of the following are biased. ['A sales office only accepts customers who have more than 200,000 cold certificate.', 'A university requires that lecturers over 50 years of age cannot participate in the evaluation of associate professors.', 'Airlines usually give better treatment to first-class passengers.', "Women's ability to work has long been questioned and denied by others."]