A certain store sells small, medium, and large toy trucks in each of the colors red, blue green, and yellow. The store has an equal number of trucks of each possible color-size combination. If Paul wants a medium, red truck and his mother will randomly select one the trucks in the store, what is the probability that the truck she selects will have at least one of the two features Paul wants?
A. 1/4
B. 1/3
C. 1/2
D 7/12
E. 2/3
OA:C
Here is how I solved this problem. Total number of different trucks: 4x3 = 12 . Probability we are looking for: P(red OR medium) + P(red AND medium) = (3/12 + 4/12 -1/12) + (1/12) = 7/12. But my answer is wrong. Can anyone help me figuring out why? Thanks!
A. 1/4
B. 1/3
C. 1/2
D 7/12
E. 2/3
OA:C
Here is how I solved this problem. Total number of different trucks: 4x3 = 12 . Probability we are looking for: P(red OR medium) + P(red AND medium) = (3/12 + 4/12 -1/12) + (1/12) = 7/12. But my answer is wrong. Can anyone help me figuring out why? Thanks!
