Which Rule Is Used in the Following Inference $$\begin{array} { l } \sim ( A \equiv B )\supset( A \cup C ) \\\sim ( A \cup C ) \\\sim ( A \equiv B )\end{array}$$

question 108

Multiple Choice

Which rule is used in the following inference? $$\begin{array} { l } \sim ( A \equiv B ) \supset( A \cup C ) \\\sim ( A \cup C ) \\\sim ( A \equiv B ) \end{array}$$

• A)HS
• B)MP
• C)MT
• D)CD
• E)DD

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