let \{1,2,3\} which of the following function f: A \rightarrow A does not an inverse function ? 1 (A) \{(1,1),(2,2),(3,3)\} (b) \{(1,2),(2,1),(3,1)\} (c) \{(1,3),(3,2),(2,1)\} (d) \{(1,2),(2,3),(3,1)\}
let \{1,2,3\} which of the following function f: A \rightarrow A does not an inverse function ? 1 (A) \{(1,1),(2,2),(3,3)\} (b) \{(1,2),(2,1),(3,1)\} (c) \{(1,3),(3,2),(2,1)\} (d) \{(1,2),(2,3),(3,1)\}

Sol:
Correct option is B. \{(1,2),(2,1),(3,1)\}