1. determine whether the following argument is valid or invalid: (A → B) → (C → D) B → D A → C ∴ B → C 2. determine whether the following argument is valid or invalid: A → B A ∨ (A & C) ∴ A & B

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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1. determine whether the following argument is valid or invalid:

(A → B) → (C → D)

B → D

A → C

∴ B → C

2. determine whether the following argument is valid or invalid:

A → B

A ∨ (A & C)

∴ A & B

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