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Represent the form of the following argument using one of the notations and then establish or refute the validity of the argument. “There is no water on Planet X. If there is life on Planet X, then Planet X contains water. Planet X will be invited to join the Confederation of Lively Planets only if there is life on Planet X. Therefore, Planet X will not be invited to join the Confederation of Lively Planets.”

Question

Represent the form of the following argument using one of the notations and then establish or refute the validity of the argument. “There is no water on Planet X. If there is life on Planet X, then Planet X contains water. Planet X will be invited to join the Confederation of Lively Planets only if there is life on Planet X. Therefore, Planet X will not be invited to join the Confederation of Lively Planets.”

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Solution

Let's represent the statements using propositional logic:

P: There is water on Planet X. Q: There is life on Planet X. R: Planet X will be invited to join the Confederation of Lively Planets.

The argument can be represented as follows:

  1. ¬P (There is no water on Planet X.)
  2. Q → P (If there is life on Planet X, then Planet X contains water.)
  3. R → Q (Planet X will be invited to join the Confederation of Lively Planets only if there is life on Planet X.) Conclusion: ¬R (Therefore, Planet X will not be invited to join the Confederation of Lively Planets.)

Now, let's establish the validity of the argument:

From statement 2 (Q → P), we can infer that ¬Q ∨ P (Either there is no life on Planet X or Planet X contains water.)

Given statement 1 (¬P), we can infer ¬Q (There is no life on Planet X.)

From statement 3 (R → Q), we can infer ¬R ∨ Q (Either Planet X will not be invited to join the Confederation of Lively Planets or there is life on Planet X.)

Given ¬Q, we can infer ¬R (Planet X will not be invited to join the Confederation of Lively Planets.)

Therefore, the argument is valid.

This problem has been solved

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