Question From Mini Exam #25

This is a spoiler! So in the video that explains this, it talks about not the first chair (i’m not sure why) but focusing on the second chair (not sure why, but when doing it gives me 432*1 = 24) but can someone explain how can we figure out the possibility using this method. I even put this question into ChatGPT and I think I got turned around more than expected.

Hi I think you asked this on Reddit?