Query about Question 12 from "(I'm Overwhelmed) Data Analysis Progress Quiz #10" [8753]

GRE GRE Quant Problem Solving
1

https://www.gregmat.com/quizzes/quiz/im-overwhelmed-data-analysis-progress-quiz-10 (Question 12)

write your question here… I’m confused about how to answer this. Why dont we use the formular for AND or OR? Is it because we don’t know wether the events are independent ?

2

Exactly. We need to consider the extremes.

Check out The Extremes of Probability