Question: May I get any help for this problems? Thank you. A lazy professor gave two tests A and B to a class of n students

May I get any help for this problems? Thank you.

May I get any help for this problems? Thank you. A lazy

A lazy professor gave two tests A and B to a class of n students and assigned marks A and B,, respectively, to student i, for i - 1,2,... ,n, uniformly and independently at random with values from the set of possible grades 1,2,.. ,k. What is the probability that some student receives the same grade in both tests

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