Yes, they are exactly the same. It's just that many people would prefer marble notebooks.
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The maximum number of marbles you have to draw is three. 1) Draw a marble. It is either white or black. 2) Draw a second marble. If it is the same colour as the first marble, we are done after two draws. 3) Otherwise, the drawn marbles have different colours. Draw a third marble. No matter what you draw next, you must have two marbles of the same colour.
None, if all the marbles that you have are yellow!
This is the same as the probability of choosing either a red of a blue marble. There are 5+4 out of 15 ways of doing this. The probability is therefore 9/15 = 3/5.
15/27. Simply take the probability of drawing a blue marble.
The probability of selecting a red marble is 3/9