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Among 12 calculator, 4 of them are defected. If we randomly choose 2 calculators, find the...

Among 12 calculator, 4 of them are defected. If we randomly choose 2 calculators, find the probability of getting at least 1 defected calculator

Math   Statistics-And-Probability   
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Answer #1

Total number of ways in which 2 calculators can be taken from 12 is ​​​​​​

There are 4 Defective and 12-4=8 non defective

Number of ways in which one defective and one non defective is chosen =4*8=32

Also number of ways in which two defective are chosen is ​​​​​​

Thus total number of ways in which at least one defective calculator can be chosen is 32+6=38

Hence the required probability is

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