Thus, the probability is $ \boxed{\frac{2}{5}} $.
Related Articles
- Total number of ways to choose 3 vials from 6:
- To get one vial of each color, we choose one red, one blue, and one green. There are 2 choices for each color:
- \times 2 \times 2 = 8 \text{ favorable outcomes}
- Question: A cognitive mapping specialist studies decision paths in a grid where each step is either forward or right. If a path from point A to point B requires exactly 4 forward moves and 3 right moves, and each move is chosen at random, what is the probability that the first move is forward and the last move is right?
- Total number of valid paths: arrange 4 F’s and 3 R’s →
- \text{Total paths} = \binom{7}{4} = 35
