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2 red ball and 1 blue ball 1.Now take two balls, one at a time, without...

2 red ball and 1 blue ball

1.Now take two balls, one at a time, without replacement. Write S. How many elements contains S

2.Finally, take two balls one at a time, with replacement. Write S. How many elements it has?

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Math   Statistics-And-Probability   
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