What is the difference between Comprehension passage and unseen passage

In most exam/test situations, the phrase probably refers to the same thing.

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comprehension passage and unseen passage has not much difference as unseen is not seen by u and is usually the summary of long passage and comprehension is data copy of the passage

What is seen and unseen passages?

No. A seen passage refers to the one you might have discussed or seen, before while an unseen passage is often a passage which is used to test the knowledge that you have grasped by understanding it.

Though they both include questions which you give answers too.

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What is the difference between seen & unseen passage?

An unseen passage is one that you have not had a chance to see before you sit down to take the exam,