3 defective brushes shipped along with 17 good ones.

what is the probility the first 2 brushes sold will be returned because they are defective and what is the probility the first 2 brushes sold will not be defective?
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1 Answer

3 bad outa 20=3/20=0.15 or 15%

chans 1 brush yu sell be bad=15%

chans first 2 brushes both bad=(0.15)^2=0.0225

=2.25%
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