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Determine whether the following symbolized arguments are valid or invalid byconstructing a truth table for each:1. K ⊃ ~K ./ ~K2. R⊃ R ./ R

Question

Determine whether the following symbolized arguments are valid or invalid by constructing a truth table for each:

  1. K ⊃ ~K
    ./
    ~K

  2. R ⊃ R
    ./
    R

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Solution

To determine the validity of the symbolized arguments, we need to construct truth tables for each argument.

  1. K ⊃ ~K ./ ~K

To construct the truth table for this argument, we need to consider all possible truth values for the proposition K and its negation ~K.

K ~K K ⊃ ~K ~K
T F F F
F T T T

In the truth table, we can see that when K is true, ~K is false, and the implication K ⊃ ~K is false. Similarly, when K is false, ~K is true, and the implication K ⊃ ~K is true. Therefore, the argument is invalid because there is at least one row in the truth table where the premise (K ⊃ ~K) is true and the conclusion (~K) is false.

  1. R ⊃ R ./ R

To construct the truth table for this argument, we need to consider all possible truth values for the proposition R.

R R ⊃ R R
T T T
F T F

In the truth table, we can see that regardless of the truth value of R, the implication R ⊃ R is always true. Therefore, the argument is valid because in every row of the truth table where the premise (R ⊃ R) is true, the conclusion (R) is also true.

In summary:

  1. The argument "K ⊃ ~K ./ ~K" is invalid.
  2. The argument "R ⊃ R ./ R" is valid.

This problem has been solved

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