3 ms·

So if I understand correctly: You trust that if a card has a color on one side, it has a number on the other side. You do not trust that if a card has a numbe

• ikeboy 11y ago
  No. I don't make any assumptions as to anything I can't see. However, regardless of what's on the back of blue, (2) will still be correct; the consequent is true, therefore the conditional is true.
  • greggyb 11y ago
    Okay, I see where you're coming from now. (1) may or may not be true. Understanding that we cannot trust (1), but that we don't care to verify it, then the 5 is necessary to prove (2). That is much more subtle than I originally interpreted from you original post. Thanks for your patient explanation.