Hello, learner. If we caused any inconvenience with your learning, we apologize. The intention behind this past exam problem-solving course was to have you read the problem in the main text and think about how you would approach solving it, providing supplementary explanations but designed so that you wouldn't read the options separately. Also, in the 'Features' section of this lecture, it stated that answers would not be disclosed in the video, and it seems you might not have checked that. And before taking the course, we also provide a preview video, and I'm not sure if you checked that either. In other words, it was created with the intention that you understand the problem setter's intent and think about it once before solving the problem while studying. Furthermore, detailed answers and solutions for the problems are available for download as a separate PDF. It seems it didn't align with your intentions, and for that, we sincerely apologize. From now on, we will progressively improve based on the feedback you've provided. Thank you.

I also took this course, and it was very helpful to me. Of course, I also passed. Thank you.