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20 is the length of a side of the fifth smallest right triangle that forms a primitive Pythagorean triple (20, 21, 29). It is the third tetrahedral number. In decimal, 20 is the smallest non-trivial neon number equal to the sum of its digits when raised to the thirteenth power (20 13 = 8192 × 10 13). [citation needed] Almost integers
If X ~ B ( n , p) and Y | X ~ B ( X , q) (the conditional distribution of Y, given X ), then Y is a simple binomial random variable with distribution Y ~ B ( n , pq ). For example, imagine throwing n balls to a basket UX and taking the balls that hit and throwing them to another basket UY.