41-43 Find the numbers at which f is discontinuous. At which of these numbers is / continuous from the right, from the left,or neither? Sketch the graph off. \text {

42. } f(x)=\left\{\begin{array}{ll} 2^{*} & \text { if } x \leq 1 \\ 3-x & \text { if } 14 \end{array}\right.