Question 1022482
(a)  {{{C(8,3)/C(20,3) = 14/285}}}

(b)  {{{C(3,3)/C(20,3) = 1/1140}}}

(c) {{{(C(8,2)*C(3,1))/C(20,3) = 7/95}}}

(d)  {{{(C(20,3) - C(17,3))/C(20,3) = 23/57}}}

(e)  {{{(8*3*9)/C(20,3) = 18/95}}}

(f)  {{{(8/20)(3/19)(9/18) = 3/95}}}