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A quality control inspector samples 2 computer chips from a box containing 13 computer chips. If the box contains 3 defective chips, in how many ways can he select a sample so that at least one of the chips is defective?

 Feb 20, 2020
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Assume that the chips are distinguishable

 

The  total  number of sets  possible  =  C(13,2)   =  78

 

The  total number of sets  which  contain  no defective chips  = C(10,2)  = 45

 

So.....the number of sets containing at least  1  defective chip  =   78  - 45  =  33

 

 

cool cool cool

 Feb 20, 2020

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