Query about Question 8 from "Timed Quant Practice - Medium Section 1 Sample #2" [8840] Thivagar

GRE GRE Quant Problem Solving
1

https://www.gregmat.com/quizzes/quiz/timed-quant-practice-set-first-medium-section-2 (Question 8)

I thought that she needs to get choclate in first round or second round, that is 1/5 for first round + 1/5 for second round, why do we need to consider the failure case for the second round?

2

Because she can win in 1st spin and lose 2nd spin and vice versa.

And she can also win both spins.