5. a) Write the ASCII - 7 coding for the word GIRL in both binary and hexadecimal notations. [6marks] b) How many bytes are required to store this word using this coding [6marks) 3. Design a device that will change serial data to parallel data, Use the design procedure for digital systems [8marks) 4. Show that (Y+A)(YA)(Y+AY+A) = 0 [6marks) 6. Using K-map, simplify the Boolean function f(A,B,C)= 11(0,1,8,9,10,12,13) and draw logic diagrams for the simplified expression by using; a. AND-OR-NOT gates [6marks) b. NOR gates only [6marks]