A person wearing slacks and a backpack climbs a ladder up the side of the rock face of a gorge .
It is impossible that there is a person wearing slacks and a backpack climbing a ladder to find gold .
It is impossible that there is a person wearing slacks and a backpack climbing a ladder to find gold .
Chances are about even that there is a person wearing slacks and a backpack climbing a ladder to find gold .
There is a person wearing slacks and a backpack climbing a ladder to find gold .