# 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?

https://brainmass.com/math/probability/probability-combinations-plums-4325

#### Solution Preview

Prob of :

<br>

<br>a) only good plums = (4 C 4)* 0.80^4 * 0.20^0 ( THAT ALL 4 ARE GOOD)

<br> = 0.4096

<br>

<br> THEREFORE NO# OF SAMPLES = Prob * No 0f ...

$2.49