Nhan is getting dressed. He considers two different shirts, three pairs of pants, and three pairs of shoes. He chooses one of each of the articles at random. What is the probability that he will wear his khakis but not his sandals? Enter your answer as a fraction in simplest form. Shirt Pants Shoes collared khakis sneakers T-shirt jeans flip-flops shorts sandals The probability that Nhan will wear his khakis but not his sandals = .