15) A one-to-four line demultiplexer is to be implemented using a memory. How many bits must each word have ?

16) What logic function is produced by adding an inverter to the output of an AND gate

17) Which of the following gates is known as coincidence detector

18) Which table shows the logical state of a digital circuit output for every possible combination of logical states in the inputs ?

19) A positive AND gate is also a negative