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How to Analyze Compound Statements

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2018-07-30 20:04:45
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If your finite math instructor asks you to analyze a compound statement, you can try using a truth table to do this. Not every topic in a discussion can be turned into a compound statement and analyzed for its truth that way, but using logic and truth values is a good technique to use when possible.

Consider the compound statement

FNTMATH_2101

When constructing a truth table, you start with the basic p and q columns. Then you add a ~ q column followed by a column

FNTMATH_2102

Before you can perform the conjunction, ^, you need a ~ p column. Here’s a step-by-step procedure.

  1. Start with a basic p and q and then add ~ q. FNTMATH_2103
  2. When adding the FNTMATH_2104 column, perform the disjunction on the first and third columns. Remember, with disjunctions, the statement is false only when both component statements are false. FNTMATH_2105
  3. Add the ~ p column. FNTMATH_2106
  4. Add the FNTMATH_2107 column, which shows the conjunction of the fourth and fifth columns. FNTMATH_2108

The conjunction is true only when the two component statements are true. This complex statement is only true when both original statements are false.

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Mary Jane Sterling (Peoria, Illinois) is the author of Algebra I For Dummies, Algebra Workbook For Dummies, Algebra II For Dummies, Algebra II Workbook For Dummies, and many other For Dummies books. She taught at Bradley University in Peoria, Illinois for more than 30 years, teaching algebra, business calculus, geometry, and finite mathematics.