Premise: "A snowboarder flips upside down with a snow covered hill in the background."\nHypothesis: "Skiers are sitting around a campfire in the dark."\nDo we know that the hypothesis entailed by the premise?
Let's think step by step.
no
Skiers sitting around a campfire could not also be a snowboarder that flips upside down.

.

Thus, the answer is no