好玩的。本來想看看大夥的答案再解釋。是這樣的，

當年一家外出旅行，在車上閑著，就跟小朋友聊天。兒子四歲女兒五歲。忘了女兒答了沒有，我兒子脫口而出的答案是這樣的

3
24
C (not 3, interesting! Thus I asked the next question)
A (interesting indeed! I randomly came up with Q5 and expect him to get stuck)
V !! (I was impressed!)

Now he is at grade 9 and I think he will stuck for a few seconds and give different answers to Q4 and Q5.