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I have over-analysed the following question and now find myself thoroughly confused. I think my issue lies with the use of the word 'some' which we are asked to assume means 'an indeterminate number greater than one' (potentially meaning all).

Is this piece of reasoning sound:

  1. This piece of reasoning is valid
    Therefore
  2. Some pieces of reasoning are valid

Even if the truth of the premise is supposed, it seems to me that the conclusion does not follow if some means all ...

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Some doesn't mean all.

It is usually taken to mean at least one.

So if I have some cards in my hand - I have at least one; not all and nor none.

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