A biased die in favour of 4 where
p(4) =0.25 is thrown repeatedly until a 4 and a 5 have been obtained.
The random variable M denotes the number of throws required. For example, for the sequence of results
4, 3, 2, 3, 4, 4, 5, the value of M is 7. Calculate E(M) and Var(M)
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