Among the 30 students registered for a course in discrete


Question: Among the 30 students registered for a course in discrete mathematics, 15 people know the JAVA programming language, 12 know HTML, and five know both of these languages.

(a) How many students know at least one of JAVA or HTML?

(b) How many students know only JAVA?

(c) How many know only HTML?

(d) How many know exactly one of the languages, JAVA and HTML?

(e) How many students know neither JAVA nor HTML?

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Mathematics: Among the 30 students registered for a course in discrete
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