Aflower shop has 11 red roses, 7 pink roses, 9 white roses, and 3 yellow roses in stock. one type of rose is randomly selected for a flower arrangement. what is the probability that the selected rose is red or yellow?

This is what i found “an explicit formula designates the nth term of the sequence, as an expression of n (where n = the term's location). it defines the sequence as a formula in terms of n. this example is an arithmetic sequence(the same number, 5, is added to each term to get to the next term).” i hope this you for what your looking for. can you plz mark me brainliest?