Expected Value

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Yadav is really fond of Maths, but is terribly weak at statistics and probability. His rival, Bathla, tries to exploit this fact whenever he can. This time as he runs into Yadav, he challenges him to find the expected value of the sum of 4 numbers chosen randomly from a list of n given numbers. Now, fortunately for Yadav, he was speaking to you on his earpiece. So, he needs you to find the answer

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solution.cppC++17

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