In the set of 20 elements {1,2,3,4,5,6,7,8,9,0,A,B,C,D,J,K,L,U,X,Y,Z} we have made a random sequence of 28 throws. What is the probability that the sequence CUBA JULY 1987 appears in this order in the sequence already thrown? probabilitycombinatorics proposedcombinatorics