Asked by Daniel

9 fair coins are independently tossed in a row. Let X be the random variable denoting the number of instances in which a Head is immediately followed by a Tail during these 9 tosses. The variance of X has the form ab, where a and b are coprime integers. What is the value of a+b?
Answered by Anonymous
429,is it correct?
Answered by Stark
no, its not. I'm try it but its wrong
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