Logic Finals

Random things which I wrote in the Logic Finals

Qn: Here is an argument, the conclusion is already given.

Premise 1:
Premise 2:
Conclusion: All cats are iPhones.

i) Write down 2 premises which make this argument invalid.

What Jeff wrote
P1: All cats are expensive
P2: All iPhones are expensive

ii) Write down 2 premises which make this argument valid.

What Jeff wrote
P1: All cats are either iPhones or Samsung tablets.
P2: No cats are Samsung tablets.

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Qn: If the premise of an argument is a contradiction, can the argument be valid?
Jeff: Yeah. True by default.

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Qn: How would this probability be calculated based on the subjectivist theory of probability?

Jeff: The probability depends on a person's intuition and judgement. If the person thinks that the probability that the event would occur is Po, where 0<Po<1, then the probability that this event would occur is Po.

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What the hell did I write... o.o

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