Q.01. Design 4 to 16 line decoder using 3 to 8 line decoder.

     Ans ==>

  -When en line is 1:

            The upper decoder gets enable and lower decoder gets disabled. So it gives output from D0 to D7. (000-111).

  -When en line is 0:

        The upper decoder gets deactivated whereas lower decoder gets activated and provides output from D8 - D15 (1000 - 1111).