Your math is a little off. Actually completely wrong. The number of passwords of length N from an alphabet of A characters is A to the power of N, (A^N) so the key ...

Provides a one-semester course in probability and statistics with applications in the engineering sciences. Probability of events, discrete and continuous random variables cumulative distribution, ...

Studies axioms, counting formulas, conditional probability, independence, random variables, continuous and discrete distribution, expectation, moment generating functions, law of large numbers, ...