Answer:

Step-by-step explanation:
Given
Selection: Without replacement
Required
The probability of selecting 2 primes
Between 1 and 12, the prime digits are: 3, 5, 7 and 11
i.e. 4 prime digits
When the first marble is selected, the probability that it will be prime is:
Since it is a selection without replacement, there are 3 primes left and 11 marbles in total.
The probability of selecting another prime is:
The required probability is:

