Q5.5

Consider a logic circuit shown in figure below. The functions $f_1, f_2 \text{ and } f$ (in canonical sum of products form in decimal notation) are : $f_1 (w, x, y, z) = \sum 8, 9, 10$ $f_2 (w, x, y, z) = \sum 7, 8, 12, 13, 14, 15$ $f (w, x, y, z) = \sum 8, 9$

The function $f_3$ is