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 'Two interesting number theory tricks'

First trick I learned this one a long time ago and have used it to entertain and amuse young kids. Ask your friend to write down a three-digit number without showing it to you. Then ask him or her to rearrange the digits to form a new three-digit number. After that, write whichever is the larger number above the other number, and then subtract the smaller from the larger, making sure that you don't see any of the numbers. Then ask the young "victim" to tell you any two of the digits of the...
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