Final answer:
The entity would find it equally difficult to believe in the existence or non-existence of trees.
Step-by-step explanation:
The conclusion of the thought experiment regarding convincing a sentient entity about the existence of trees is that the entity would find it equally difficult to believe in the existence or non-existence of trees. This is because beliefs about the existence of trees depend on intuitive experiences, which can vary from person to person. In the thought experiment, the entity's beliefs about trees would ultimately depend on its own subjective experiences.