Premise: A stocky gentleman wearing a long-sleeve , blue shirt , black slacks , aged , black boots and a blue billed cap is scaling a roof , using the structure 's struts to approach stacks of tiles stored at the roof 's apex .
Correct statement: It is impossible that the man in the black boots is on the steps of a house , ringing a doorbell .
Incorrect statement: It is probable that the man in the black boots is on the steps of a house , ringing a doorbell .