Five marbles are drawn from a bag which contains 7 blue marbles and 4 black marbles. What is the probability that:  (i)all will be blue? (ii)3 will be blue and 2 black?

Explanation

To solve the problem, we need to calculate the probabilities for two different scenarios involving the selection of marbles from a bag containing 7 blue marbles and 4 black marbles.

### Given:
- Total blue marbles = 7
- Total black marbles = 4
- Total marbles = 7 + 4 = 11

### (i) Probability that all marbles drawn will be blue:
...