Asurvey was conducted among 78 patients admitted to a hospital cardiac unit during a two-week period. the data of the survey are shown below. let b equals the set of patients with high blood pressure. let c equals the set of patients with high cholesterol levels. let s equals the set of patients who smoke cigarettes. n(b) equals 36 n(b intersect s) equals 10 n(c) equals 34 n(b intersect c) equals 12 n(s) equals 30 n(b intersect c intersects) equals 5 n[(b intersect c) union (b intersect s) union (c intersect s)] equals 21