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

Algebra ->  Permutations -> 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      Log On


   

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(52780) About Me  (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. 

     1%2FC%5B17%5D%5E4.


     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. ​ 

    1%2FC%5B17-4%5D%5E4 = 1%2FC%5B13%5D%5E4.


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

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

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

If you have questions, let me know.

Post a message to me through the "Thank you" window/form.

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.