this is dependent and independent probability question

3/35 = 8.57142 % or about 86 times out of 1000.

The reason these are dependent events is that once an "A" has been drawn, it reduces the number of "A"s remaining to be drawn and it reduces the number of tiles from which the next tile can be drawn.

If, having drawn an "A", it was then replaced in the tiles from which the next tile was to be drawn, these would be independent events and the probability of drawing two "A"s would then be (15/50)*(15/50)= 0.09 or slightly greater than if the two events were dependent. This would be exactly 90 times out of 1000 or 9 times out of 100..