Problem 6.2.8 A manufacturer of kitchen appliances tests the reliability
of its refrigerators by recording in a laboratory test the elapsed time between
consecutive failures. Let E be the event "more than 9 months" and F the
event "less than 2 years". Describe the events E intersect F, E union F,
E', F', and (E union F)'.


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Problem 6.2.13: Let S = {a,b,c}. Determine all possible events associated with
S.