Question: 1. Prove that the argument is valid [(CD)C][(CD)D] 2. Prove that the following argument is valid (P(QR))(RS)(ST)(TP) 1. Prove that the argument is valid 2.

1. Prove that the argument is valid [(CD)C][(CD)D] 2. Prove that the following argument is valid (P(QR))(RS)(ST)(TP)
1. Prove that the argument is valid 2. Prove that the following argument is valid
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