Indicate the formula for the following conditions. p(n, r)=

The formula is a permutation in which n represents the sample points in the set, while r represents the number of sample points in each permutation.

n!/r!(n-r)!

The formula is the same as the combination formula except for the multiplication of r! in the denominator.

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.