#### Answer

if a security code is not entered then door will not open

#### Work Step by Step

r unless s means if ∼s then r.

Published by
Cengage Learning

ISBN 10:
0-49539-132-8

ISBN 13:
978-0-49539-132-6

if a security code is not entered then door will not open

r unless s means if ∼s then r.

You can help us out by revising, improving and updating this answer.

Update this answerAfter you claim an answer you’ll have **24 hours** to send in a draft. An editor
will review the submission and either publish your submission or provide feedback.