What are the formulas to be memorized to simplify Probability Questions?
These would be a great start: \(Most ~Important\) http://en.wikipedia.org/wiki/Combination http://en.wikipedia.org/wiki/Permutations#In_combinatorics http://en.wikipedia.org/wiki/Binomial_theorem http://en.wikipedia.org/wiki/Bayes%27_theorem http://en.wikipedia.org/wiki/Inclusion%E2%80%93exclusion_principle \(Some ~Important Distributions\) http://en.wikipedia.org/wiki/Normal_distribution#Standard_normal_distribution http://en.wikipedia.org/wiki/Exponential_distribution#Probability_density_function And to simply factorial calculations, this one is helpful http://en.wikipedia.org/wiki/Stirling%27s_approximation Know especially the difference between sampling with replacement and without replacement. This will determine whether you need factorials or powers, respectively. Know the difference between permutations and combinations.
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