A bank has 3 locks with a key for each lock. Each key is ownedby a different
person. In order to open the vault door at least two people mustinsert their keys into
the assigned locks at the same time. The trainee (i.e. person C)can only open the
vault when the manager (i.e. person A) is present in the opening.The signal lines
(A,B,C) are 1 if the key is inserted into locks 1,2,3respectively.
? Determine the truth table for such a digital lockingsystem.
? Design, using Karnaugh Map techniques, a minimum AND-ORgate
network to realise this locking system.
? Implement the minimal circuit found in the previous sectionusing:
?
OR
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