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 Mar14 awarded Notable Question Aug27 awarded Popular Question Nov15 accepted Proving an argument to be invalid Nov15 comment Proving an argument to be invalid Sorry, It's my mistake. I have applied the inference rule wrongly in line 11. So, the argument is invalid. Nov15 awarded Editor Nov15 comment Proving an argument to be invalid I added my proof, please let me know if it is wrong. Nov15 revised Proving an argument to be invalid added 649 characters in body Nov15 asked Proving an argument to be invalid Nov13 accepted Deducing “Some are ” from “All are”? Nov13 comment Deducing “Some are ” from “All are”? @Thomas: It's from my book that I read. Nov13 comment Deducing “Some are ” from “All are”? So it would be true if I had, 1. All are Italian 2. There is at least one Italian 3. Therefore, Some are Italian I suppose this what you meant by non-empty collection? Nov13 asked Deducing “Some are ” from “All are”? Oct11 awarded Student Oct11 awarded Scholar Oct11 accepted Probability of tossing a coin Oct11 accepted Example of non-mutually exclusive event using a coin Oct11 comment Example of non-mutually exclusive event using a coin In my example, the first event is tossing heads and the second event is tossing tails. So, they are mutually exclusive i.e. having no outcomes in common and the probability for either of event is 1. Oct11 asked Example of non-mutually exclusive event using a coin Oct11 comment Probability of tossing a coin What would be the correct wording for a question according to my answer? Oct11 asked Probability of tossing a coin