# Question

A fair die is successively rolled. Let X and Y denote, respectively, the number of rolls necessary to obtain a 6 and a 5. Find

(a) E[X];

(b) E[X|Y = 1];

(c) E[X|Y = 5].

(a) E[X];

(b) E[X|Y = 1];

(c) E[X|Y = 5].

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