SOLUTION
Looking at this, we have a total of four prices.
When the first price is picked, the probability becomes
After the first price is picked, we have 3 prices left. The probability of picking the second becomes
Probability of picking the 3rd becomes
Note that this is without replacement, hence the probability of picking the last becomes
So the require probability becomes
Hence the answer is
It is a dependable probability because it is a probability without replacement, since the preceding event has an effect on the probability of the next event
Hence the answer is dependable probability