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Directions: Assume the given proposition is true, perform the required logical operation, and state the resultant proposition. Then, state the resultant truth value.

Example: What is the converse of "No bromeliads are arctic plants"?
Answer: No arctic plants are bromeliads. True

1. What is the contrapositive of "Some cryptoanalysts are ex-NSA workers"?

          Some non-ex-NSA workers are noncryptoanalysts. Undetermined.  
OR
          Some NSA workers are noncryptoanalysts.  Undetermined.

2. What is the obverse of "Some fossils are not parts of igneous rocks"?

          Some fossils are nonparty of igneous rocks.  True. 

3. What is the converse of "All movie stars are unhappy persons"?

          All unhappy persons are movie stars.  Undetermined.

4. What is the obverse of "No efficient devices are solar cells"?

          All efficient devices are nonsolar cells.  True

5. What is the contrapositive of "All exhaust fumes are gasses unsafe to breathe"?

          All gasses safe to breathe are nonexhaust fumes.  True.

Please be sure you have stated the resultant truth values for these questions. 

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11.22.04       © 2004  Licensed under GFDL

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