 
 <translate> Question: If f(x)=1/x and x is a natural number, what CANNOT be the answer for f(f(x))?
Options:
(A) 1/7
(B) 3
(C) 12/3
(D) 6/6
(E) 1 Let's think first. Some random reasoning: <ibo> Ajụjụ: Ọ bụrụ na f (x) = 1/x na x bụ ọnụọgụgụ, gịnị bụ azịza maka f (x)? Nhọrọ: (A) 1/7 (B) 3 (C) 12/3 (D) 6/6 (E) 1 Ka anyị buru ụzọ chee echiche. Ụfọdụ echiche na-enweghị isi: 