Every summer, Isaiah goes on a week-long canoe trip with his childhood camp friends. After the trip, he usually purchases some oars from the destination city. His collection of oars is organized by year and type of wood. 2010 2011 Spruce wood 4 2 Ash wood 2 3 What is the probability that a randomly selected oar was made from spruce wood and was purchased in 2011? Simplify any fractions.