Tan Lu Yuan asked again.
Qiao Yu looked up at the ceiling, he even felt that Tan Lu Yuan was testing for stupidity.
Fortunately, Qiao Xi had no hesitation and answered immediately: "There should be two paths, namely ABCA and ACDA."
"Hmm, not bad, not bad. How about I propose a question? Just answer it if you feel like it."
Yuan Zhengxin, who had been quietly listening on the side, seemed suddenly interested and interjected: "Consider an irregular decahedron, with each face being an irregular triangle.
Knowing that this decahedron has only seven vertices, the question is how many edges does it have, and if possible, summarize the adjacency relationship of each face."
This time, Qiao Xi thought for a while before answering: "I think it has fifteen edges? As for the adjacency relationship, since each face of the decahedron is triangular, each face should have an adjacency relationship with another three faces."
Alright, Qiao Yu realized he was concerned to a fault.
