Premise: "A boy in a pink t-shirt is riding a bike over a sand pile while two others are riding in the street."
Hypothesis: "The boy and his friends are outside."
Do we know that the hypothesis entailed by the premise?
Let's solve step-by-step:
Two boys who are riding in the street need not necessarily be FRIENDS with a boy who is riding a bike over a sand pile. The answer is it is not possible to tell.