Type the correct answer in each box. Use numerals instead of words. If necessary, use / for the fraction bar.
Nelson wants to plant a tree in each of three locations in his backyard. He has three kinds of trees to choose from: oak, cedar, and elm. He can choose from zero to three trees of each kind.
If Nelson randomly picks a tree for each location, the probability of him planting one oak tree, one cedar tree, and one elm tree is and the probability of him planting two oak trees and one elm tree is .