My Math Forum Probability - same answer 4-in-a-row on multiple choice exam

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 May 18th, 2010, 12:47 PM #1 Newbie   Joined: May 2010 Posts: 1 Thanks: 0 Probability - same answer 4-in-a-row on multiple choice exam The following questions are assuming that the answer choices are randomly generated (no human bias in avoiding certain sequences). I would greatly appreciate everyone's help with the following (related) probability questions. I believe they involve something called binomial probability but it's been several years since I've taken any math course and don't believe I ever took any math that dealt with these kinds of questions. Can someone please show me how to solve them? Thank you! On an multiple-choice exam's answer key, what are the chances of a particular answer choice appearing 4 times in a row, assuming there are 5 answer choices (A, B, C, D, & E) and 25 questions on the exam? How many 4-in-a-rows would one expect over the course of 256 25-question exams? What are the chances of having 2 4-in-a-row occurrences in the same 25-question exam? The letter doesn't have to be the same for each occurrence. How many of these would one expect over the course of 256 25-question exams? What are the chances of a particular 5-answer sequence (such as "ABCDE") occurring 3 times over the course of 256 25-question exams? How many ABCDE sequences would one expect over the course of 256 25-question exams?
 May 18th, 2010, 04:23 PM #2 Senior Member   Joined: Jan 2009 Posts: 345 Thanks: 3 Re: Probability - same answer 4-in-a-row on multiple choice exam Try something even if its wrong. You get much better feedback after trying because you'll know what YOU need to do next time.

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