SOLUTION: A box contains 17 ​transistors, 4 of which are defective. If 4 are selected at​ random, find the probability that a. All are defective. (Type a fraction. Simplify your​ answ

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Question 1132415: A box contains 17 ​transistors, 4 of which are defective. If 4 are selected at​ random, find the probability that
a. All are defective. (Type a fraction. Simplify your​ answer.)
b. None are defective. ​(Type a fraction. Simplify your​ answer.)
Answer by ikleyn(52781)   (Show Source): You can put this solution on YOUR website!
.
A box contains 17 ​transistors, 4 of which are defective. If 4 are selected at​ random, find the probability that


a.   All are defective. 

     .


     This problem assumes that you are familiar with combinations.

     Therefore, I leave it to you to get the numerical value from this formula.


b.   None are defective. ​ 

     = .


     Again, this problem assumes that you are familiar with combinations.

     Therefore, I leave it to you to get the numerical value from this formula.

----------------- 

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Do not forget to refer to the ID number of the problem, which is  1132415  in this case - otherwise I will not know to whom to answer.


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