CPM Homework Help : AC Problem 11-81

Function Machine. Input: x = 1, Rule: f of x equals x divided by the difference of x minus 1, Output: f of 1 equals question mark. Find the output for the relation with the given input. If there is no possible output for the given input, explain why not.

Hint :

Substitute $1$ for $x$ and evaluate. Does your answer make sense?