1. Which of the following cannot be a probability density function on the domain given? Select all that apply. p (n) = 1 ifn = 1 0 on n = 1, 2, .. . otherwise p (n): 10 on n = 0, 1, ..., 10. p (n) = 10 on n = 0, 1, ...,9. if n even p ( n ) = on n = 0, 1, ...,9. if n odd p(n) = - onn = 1, 2, ... n if n even p(n) = on n = 0, 1, ...,9. if n odd