The Leaderboard

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A lot of people participating in a contest are obsessed with looking at the leaderboard to see how they are doning (Even you might have checked it just now. Hope you are doing well :P). Considering there are $N$ teams participating and there are $M$ problems in the contest. What would be the expected number of problems solved by the team at rank $K$ on the leaderboard? If the expected value

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solution.cppC++17

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