a)  both discs are white           

b)  both discs are red

c)  both discs are the same color

d)  both disks are different color


Before to start, notice that there are  (8 + 5 + 1) = 14 disks in jar A  and  

                                       (10 + 9 + 2) = 21 disks in jar B.


Now I answer questions a) - c):


a)  the probability is 0 (zero, ZERO), since there is no white disk in jar A;

b)  

c)   = , the sum of probabilities to have 2 red disks and/or 2 blue disks.