An article in The Joumal of Data Science ["A Statistical Analysis of Well Failures in Baltimore County" (2009, Vol. 7, pp. 111-127)] provided the following table of well failures for different geological formation groups in Baltimore County, Let A denote the event that the geological formation has more than 1000 weils, and let B denote the event that a well failed. Determine the number of wells in each of the following events. (a) AB (b) Af (c) AB (d) AB (e) AfB