An Airbnb home has installed a combination lock with push buttons labeled A though F (six buttons) and uses four of these buttons in any order. Push Buttons cannot be used more than once to unlock the door. For example, a code such as AFDC is allowed, but AFDA is not. How many different codes does this lock provide? Multiple Choice 180 24 1,296 360

8y^50

step-by-step explanation:

answer: 20

step-by-step explanation:

whole numbers.

step-by-step explanation:

we are given the average monthly rainfall (in millimeters) model r(m) for the years 1900-2009 as a function of the month number m.

as we can see m is taken for the number of months for years 1900-2009.

we know that number of months can't be a negative number or decimal number or a fraction.

so, the number of months could be only positive whole numbers.

therefore, whole numbers is more appropriate for the domain of r.