Question

A combination padlock in which a sequence of numbers is used as the "key" to open the lock. Suppose a combination padlock has 10 digits to choose from for each of the four sections of the lock.Does the "key" for a combination padlock involve permutations or combinations?

Answer 1

Given:

A combination padlock in which a sequence of numbers is used as the "key" to open the lock.

There is a combination padlock has 10 digits to choose from for each of the four sections of the lock.

The "key" for a combination padlock involves permutations.

Because: the arrangement of the digit is important

For example: 0123 is different than 3210