Question 661096
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
in a lot of 20 tires, 3 are defective and {{{17}}} not defective...
if you pick 4 tires at random 
what is the probability that you will get 1 defective tire: {{{P = 3C1*17C3/(20C4)}}}