Question: Determine if the following are valid: 1) C D ( B C D) ( B ( A B)) C D Therfore A B 2) (PR)

Determine if the following are valid:

1) C D

( B C D)

( B ( A B)) C D

Therfore A B

2) (PR)

Therfore (Q (P R))

3) (L. Carroll^2) No professors are ignorant.

All ignorant people are vain.

Therfore no professors are vain.

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