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The Art of Problem-Solving: Inductive and Deductive Reasoning

Explore the differences between inductive and deductive reasoning, understanding premises, and drawing conclusions. Learn strategies for problem-solving and applications in numeracy.

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The Art of Problem-Solving: Inductive and Deductive Reasoning

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  1. Chapter 1 The Art of Problem Solving

  2. Chapter 1: The Art of Problem Solving • 1.1 Solving Problems by Inductive Reasoning • 1.2 An Application of Inductive Reasoning: Number Patterns • 1.3 Strategies for Problem Solving • 1.4 Numeracy in Today’s World

  3. Section 1-1 • Solving Problems by Inductive Reasoning

  4. Solving Problems by Inductive Reasoning - Objectives: • Be able to distinguish between inductive and deductive reasoning. • Understand that, in some cases, inductive reasoning may not lead to valid conclusions.

  5. Characteristics of Inductive and Deductive Reasoning • Inductive Reasoning • Draw a general conclusion (a conjecture) from • repeated observations of specific examples. There • is no assurance that the observed conjecture is • always true. • Deductive Reasoning • Apply general principles to specific examples.

  6. Definitions • A premise can be an assumption, law, rule, widely held idea, or observation. Then, reason inductively or deductively from the premises to obtain a conclusion. The premises and conclusion make up a logical argument.

  7. Example: Identifying the Premise and Conclusion • Identify each premise and the conclusion in the following argument. Then tell whether the argument is an example of inductive or deductive reasoning. • Our house is made of brick. Both of my next-door neighbors have brick houses. Therefore, all houses in our neighborhood are made of brick. • Solution (next slide)

  8. Example: Identifying the Premise and Conclusion • Solution • The premises are “Our house is made of brick” and “Both of my next-door neighbors have brick houses.” The conclusion is “Therefore, all houses in our neighborhood are made of brick.” Because the reasoning goes from specific examples to a general statement, the argument is an example of inductivereasoning (although it may very well be faulty).

  9. Example: Identifying the Premise and Conclusion • All quadrilaterals have 4 sides. • Therefore, a rectangle is a quadrilateral. Solution The premise is “All quadrilaterals have 4 sides”. The conclusion is “Therefore, a rectangle is a quadrilateral.” Because the reasoning goes from a general statement to a specific statement, the argument is an example of deductive reasoning.

  10. Example: Predicting the next number in a sequence • Use inductive reasoning to determine the probable next number in the list below. • 5, 9, 13, 17, 21, 25, 29 • Solution • Each number in the list is obtained by adding 4 to the previous number. • The probable next number is 29 + 4 = 33.

  11. Example: Predicting the product of two numbers • Use the list of equations and inductive reasoning to predict the next multiplication fact in the list: • 37 × 3 = 111 • 37 × 6 = 222 • 37 × 9 = 333 • 37 × 12 = 444 • Solution • 37 × 15 = 555

  12. Pitfalls of Inductive Reasoning • One can not be sure about a conjecture until a general relationship has been proven. • One counterexample is sufficient to make the conjecture false.

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