[大學]請問這題要怎麼做...

[大學]請問這題要怎麼做...

請幫我 於 星期三 十一月 02, 2016 9:15 pm


A box contains four balls and two blue balls. Balls are drawn at random without replacement,
and the random variable X measures the total number of balls selected up to the point when both blue balls have been selected.

(a). What is the probability mass function of X?

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