1. (2pts) Suppose wehave market basket data consisting of 100 transactions and 20 items. If the support for item A is 25%, the support for item B is 90% and the support for itemset {A,B} is 20%. Let the support and confidence thresholds be 10% and 60% respectively.

1)compute the confidence of the association rule A->B

2) Is the rule meaningful to user? Describe the nature of relationship between item A and B.