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Probability and combinations with plums

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There are 5 rotten plums in a crate of 25 plums. How many samples of 4 of the 25 plums contain
(a) Only good plums?
(b) Three good plums amd 1 rotten plum?
(c) One or more rotten plums?

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Prob of :
<br>a) only good plums = (4 C 4)* 0.80^4 * 0.20^0 ( THAT ALL 4 ARE GOOD)
<br> = 0.4096
<br> THEREFORE NO# OF SAMPLES = Prob * No 0f ...

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