A building has 20 floors above the ground floor. Four people walk into this building on the ground floor, on their way to some floor above the ground.

When they reach the elevator, each person only presses the button of the floor they are going to.

What is the probability that 4 buttons for consecutive floors are pressed?

1/24

Step-by-step explanation:

using Permutations and Combinations

1. 3

2. 4

3. 1

hope this ! have a great day.

-wfz

sample answer: you can determine whether each element of the domain is paired with exactly one element of the range. for example, if given a graph, you could use the vertical line test; if a vertical line intersects the graph more than once, then the relation that the graph represents is not a function.