Question: A bank vault has three locks with a different key for each lock. Each key is owned by a different person. To open the door,

A bank vault has three locks with a different key for each lock. Each key is owned by a different person. To open the door, at least two people must insert their keys into the assigned locks. The signal lines

A, B,

and

C

are

1

if there is a key inserted into lock

1, 2,

3,

respectively. Write an equation for the variable

Z

which is

1

iff the door should open.

A bank vault has three locks with a different key for

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