 
 <translate> Answer A is impossible because the invers of 1/x is x, and the only way to have something other than a natural number is to input something other than a natural number. With the specification that only natural numbers may be used 1/7 is not a possibility for f(f(x)) The final answer: (A). <ibo> Azịza A agaghị ekwe omume n'ihi na inverse nke 1/x bụ x, na naanị ụzọ iji nweta ihe ọzọ karịa nọmba nkịtị bụ itinye ihe ọzọ karịa nọmba nkịtị. Site n'ịkọwapụta na enwere ike iji naanị ọnụọgụgụ nkịtị 1/7 abụghị ohere maka f ((f ((x)) Azịza ikpeazụ: (A). 