Answer:
- see the attached truth table
- Opens = AB + AC
Step-by-step explanation:
i) In the attached truth table, TRUE means the respective key owner is present and their keys are inserted at the same time. The "Opens" column is TRUE when two owners are present, not including the case where the only two owners present are B and C.
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ii) The second attachment is a Karnaugh map of the truth table. The circled terms are ...
Opens = AB +AC