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Theresab2021
29.07.2019 •
Mathematics
Apackage contains 10 resistors, 2 of which are defective. if 3 are selected, find the probability of getting 1 defective resistor.
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Ответ:
10C3= 10!/ (10-3)! 3!= 10*9*8 / 3*2= 120 ways
There are 2 defective resistors and 8 normal resistors. The possible ways to take 1 defective resistors and 2 normal resistors would be: 2C1* 8C2= 2* 8*7/2 = 56 possible ways
Then, the probability of getting 1 defective resistor would be: 56ways / 120 ways= 46.7%
Ответ: