Question 1134345
Both are dotted.  There are 12 pieces and 6 are dotted.  Both are dotted is 6/12*6/12=0.25 probability. 
First is black has probability 4/12 and second is dotted has probability (1/2), so joint probability is 1/6.
One is black and one striped
May be (1/3)(1/6)=1/18 if in that order
Or may be (1/6)(1/3)=1/18 in opposite order 
For either, probability is the sum or 1/9