Question 1094148
Required possibility (selecting 4 brown) = ?
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Since 5 marbles are drawn of 19 [3 purple, 10 brown and 6 green]
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Possible events like to turn up include:
~ 4 browns, 1 purple and 0 green
or
~ 4 browns, 0 purple and 1 green
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Collecting attributes, we'll've
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(10C4*3C1*6C0) + (10C4*3C0*6C1)
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= (210*3*1) + (210*1*6)
= 630+1260
= 1890 possibilities
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.'. 4 browns of 5 selected balls of 19 can occur as many as 1890 times. Thus, 1890 samples are formable.
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Your friend,
Francis.