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examples of disjunctive reasoning

Systematic reasoning - Patterns of deductive thinking

Decide whether the following disjunctive arguments are valid or invalid:

1. Either Bowser ran away or he was hit by a car.
Bowser ran away.
Therefore, Bowser was not hit by a car.

2. Either Bowser ran away or he was hit by a car.
Bowser is too smart to be hit by a car.
Therefore, Bowser ran away.

3. Either you are with us or against us.
You are not with us.
Therefore, you are against us.

Solution Preview

1) Valid. The choice is either A (ran away) or B (hit by a car). The 'or' means that if B, then not A. ...

Solution Summary

going from either/or to therefore. systematic reasoning and examples of disjunctive arguments

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