(Section 0.2: Logic) 0.2.6 A Venn diagram may clarify matters. • (We assume there are no modifiers such as “+” or “±” and no pass/fail grading.) §Example 5 (An “If-and-Only-If” Statement)Consider the (true) statement: IfI get an A, B, or Cp±²³³³´³³³, thenI passq±²´
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Black-and-white films, Mathematical logic, If and only if, pass/fail grading