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MathJax(?): Can't find handler for document
Consider the experiment of rolling a fair die independently until the same number/face occurs 2 successive times and let X be the trial on which the repeat occurs, e.g. if the rolls are 2,3,4,5,1,2,4,5,5, then $$.

a. find the probability function $f(x)=P(X=x)$

b. compute EX

a. find the probability function $f(x)=P(X=x)$

b. compute EX