Harvard's exam question 哈佛考题

This is the question from Harvard's Science Research. 这是哈佛科学研究的考题。

Use of calculator is prohibited.  禁止用计算机。

The question is.... If 考题如下：如果


1 = 5 
2 = 25 
3= 125 
4 = 625 

5 =?






Answer is at the bottom， 答案在下面



















Answer is 答案是 =1 

Have you forgotten？你忘了？ 1=5 



Got it wrong like me? 像我这样答错了？
No wonder you also did not get into Harvard. Ha, ha, ha……!! 哈哈哈，难怪你也进不了哈佛。。。。