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Assume that you have a collection of marbles: 50 red, 50 blue, 40 orange, and 70...

Assume that you have a collection of marbles: 50 red, 50 blue, 40 orange, and 70 yellow. Assuming that the marbles of each color are identical,

(a) How many ways are there to select 20 of the marbles?

(b) How many ways are there to select 20 of the marbles with at least one marble of each color?

(c) How many ways are there to select 20 of the marbles with even number of marbles of each color?

Math   Statistics-And-Probability   
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