Question

it is true that a student can't be more knowledgeable than teacher

Answer 1

yes it is a true students can't be more knowledgeable than teacher

Answer 2

No, it isn't true as a student can be more knowledgeous than a teacher only when he or she studies hard enough and whose basics are clear. Although teachers are more knowledgeous, students can be better than them. Teacher have more knowledge because they have a experience of many years but students don't have. This is the cause for which teachers are more knowledgeable than students.
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