Mining of Data Sets - Chapter 6.1, Problem 8E: I need help with this question (I don't know how to mathematically comput

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Mining of Data Sets - Chapter 6.1, Problem
8E:
I need help with this question (I don't know how to
mathematically compute the probabilities for Sup(xUy) = Sup(x) *
Sup(y)):
Exercise 6.1.8 : Prove that in the data of Exercise
6.1.4 there are no interesting association rules; i.e., the
interest of every association rule is 0.
If the support threshold is 5, which items are frequent?
Which pairs of items are frequent?
This is the said data:
Exercise 6.1.4 : This question involves data from which nothing
interesting can be learned about frequent itemsets, because there
are no sets of items that are correlated. Suppose the items are
numbered 1 to 10, and each basket is constructed by including item
i with probability 1/i, each decision being made independently of
all other decisions. That is, all the baskets contain item 1, half
contain item 2, a third contain item 3, and so on. Assume the
number of baskets is sufficiently large that the baskets
collectively behave as one would expect statistically. Let the
support threshold be 1% of the baskets. Find the frequent
itemsets.