Leo: Premise: "One biker wearing a helmet is jumping over an obstacle."
Based on this premise, can we conclude that the hypothesis "One biker wearing no helmet is jumping over an obstacle." is true?
Options:
- yes
- it is not possible to tell
- no
Mei: OK, So, let's think first...
Me:
The biker can't have a helmet and no helmet on at the same time.
Thus, the answer is no.