Question 1132415
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A box contains 17 ​transistors, 4 of which are defective. If 4 are selected at​ random, find the probability that



a.   All are defective.


<pre>
     {{{1/C[17]^4}}}.


     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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b. &nbsp;&nbsp;None are defective. ​


<pre>
    {{{1/C[17-4]^4}}} = {{{1/C[13]^4}}}.


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

     Therefore, I leave it to you to get the numerical value from this formula.
</pre>

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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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