Web Science/Part2: Emerging Web Properties/Modelling Similarity of Text/Jaccard Similarity for Sets/quiz

{given D1 = a a a b and D2 =  b b b a what is the jaccard coefficient of the corresponding word sets?} + 1/1 - 2/4 - 2/8 - 2/6

{given D1 = a b c d e and D2 = e f g h what is the jaccard coefficient of the corresponding word sets?} - 0 - 1/7 + 1/8 - 1/9 - 2/8