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 Feb27 accepted Entropy of geometric random variable with parameter $1/2$ Feb27 comment Entropy of geometric random variable with parameter $1/2$ Ok. I removed it. I'll look into this with greater detail later to figure/close this. :) (Anyway, thanks all for your help. It was greatly appreciated. I passed at the class btw.) Jul12 revised Entropy of geometric random variable with parameter $1/2$ added 16 characters in body Jul11 asked Relation between Kraft's inequality and optimal entropy encoding codes Jul11 awarded Supporter Jul10 comment Uses needed to break a substitution cipher (alphabet of 5 symbols, normalized entropy of the source of 2) Ok. Thanks. :) I get it but care to explain one more thing? Why the entropy of the source is $log_2 120 + 2N$ instead of $(log_2 5)N$? How can I get that entropy only knowing the normalized one? Jul10 accepted Uses needed to break a substitution cipher (alphabet of 5 symbols, normalized entropy of the source of 2) Jul10 awarded Editor Jul10 revised Uses needed to break a substitution cipher (alphabet of 5 symbols, normalized entropy of the source of 2) deleted 9 characters in body Jul10 asked Uses needed to break a substitution cipher (alphabet of 5 symbols, normalized entropy of the source of 2) Jul10 awarded Scholar Jul10 comment Entropy of geometric random variable with parameter $1/2$ Cool, thanks. Got it. So in the end the answer to the question is 4. none of the above; Jul10 awarded Student Jul10 asked Entropy of geometric random variable with parameter $1/2$