MHB By using rules of inference how the valid conclusion can be determined?

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The discussion centers on the application of rules of inference to determine valid conclusions. A participant expresses confusion about how to apply these rules and requests a clear explanation. Another participant confirms the correctness of an answer related to the topic, suggesting that the inquiry has been addressed. The conversation highlights the importance of understanding logical reasoning in drawing valid conclusions. Overall, the thread emphasizes the need for clarity in explaining rules of inference.
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Honestly, I do not really understand how to apply rules of inference. So i would appreciate if u could explain without missing any point.
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I think i got this, is this the correct answer? Pls refer to image.
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Hello, yakin!

You are correct!
 

Thread 'A variant of the Monty Hall problem'

There is a nice little variation of the problem. The host says, after you have chosen the door, that you can change your guess, but to sweeten the deal, he says you can choose the two other doors, if you wish. This proposition is a no brainer, however before you are quick enough to accept it, the host opens one of the two doors and it is empty. In this version you really want to change your pick, but at the same time ask yourself is the host impartial and does that change anything. The host...
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