Susan owns a flower shop. She has a selection of 8 orchids, 6 roses, and 5 petunias. A couple comes in to choose flowers for their upcoming wedding. They decide to randomly select 3 flowers.

What is the probability that they select 2 orchids and 1 rose?

What is the probability that they select 3 petunias?

What is the probability that they select one of each flower?