one-line
Factorial
the number of ways to order n unique items.
n! = (n)(n-1)...(1)
0!=1, since there is only one way to order 0 items.
Multiply
rescale
multiplication
step growth = next step, double the current
natural growth = consider each part, grow little by little
Statistics
variance and standard deviation = dispersion
expected value = long-term average
covariance = two variables have same changes or not
Binomial / Bernoulli / Poisson
皆是Yes or No events
binomial = discrete occurrences among discrete trials. (擲骰子10次, )
poisson = discrete occurrences among a continuous domain. (5年一次地震, )
bernoulli = single Binomial event
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