Assume students randomly choose their answers to a homework similar to this one, with 18 questions, of 4 possible answers each. Using the appropriate result in [KL, appendix A], which among these numbers is the smallest number of students so that with probability at least 0.5 at least two students give the same answers to all questions

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Step-by-step explanation:

the answe i =−n+5

coin flip

non-answer:

choosing

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