Abag of marbles contains 3 red marbles, 4 blue marbles, and 6 green marbles. if two are pulled out without replacement, find the probability of getting one red and one blue marble.(can you show the work so i can see what to do and how to get the answer)

Iwill give brainliest. suppose tommy walks from his home at (0, 0) to the mall at (0, 5), and then walks to a movie theater at (6, 5). after leaving the theater tommy walks to the store at (6, 0) before returning home. if each grid square represents one block, how many blocks does he walk?