The last step gives the line number needed for its derivation. You are to determ

Question

The last step gives the line number needed for its derivation. You are to determine the replacement rule that justifies the step.

1. A B
2. (A B) (B A) 1, ______

Choose the answer that completes the missing part of the proof.

1. (A v B) (A v C)
2. A v (B C) 1, ______

The last step of the example gives the number of the step needed for its derivation. You are to provide the justification (the replacement rule).

1. ~ (A v B)
2. ~A · ~ B 1, ______

The last step gives the line number needed for its derivation. You are to determine the replacement rule that justifies the step.

1. (H G) K
2. ~G ~H
3. H G   2, ______

Explanation / Answer

1 part ans =c c is equiv bcoz  (A B) (B A)

2 part ans =d;

c part ans =d; bcoz it shows DM

d part ans =c;

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