A Door Lock Is Opened by Pushing a Sequence of Buttons

question 16

Essay

A door lock is opened by pushing a sequence of buttons. Each of the three terms in the combination is entered by pushing either one button or two buttons simultaneously. If there are 5 buttons, how many different combinations are there? (Example: 1-3, 2, 2-4 is a valid combination.)

---

Definitions:

Face Value

The apparent worth or truth of something, taken without questioning or seeking deeper understanding.

Education Records

Documents and information about a student's educational history and performance, maintained by an educational institution.

FERPA

The Family Educational Rights and Privacy Act, a federal law that protects the privacy of student education records.

Federal Law

Federal law consists of rules and regulations that are enacted by the national government and applicable throughout the country.