Two integers from 1 through 40 are chosen by a random number generator. write your answer as a fraction in simplest form a/b. p(the same number is chosen twice)

Charlie is at an amusement park that has 18 different rides. each ride costs $1.75. the function c(r) = 1.75r represents the total amount of money that charlie will spend if he goes on r rides, but he never goes on the same one more than once. what domain and range are reasonable for the function?