A pack of “Jameson's” cigarettes contains 20 cigarettes, of which 2 to 5 cigarettes (randomly) are defective. What are the greatest possible chances of picking a non-defective cigarette? Choose the correct choice from the following answers:
A) 0.1
B) 0.25
C) 0.5
D) 0.75
E) 0.9
greatest chance of picking a non defective will exist when defective pieces are least = 2   greatest chance = (18/20)= 
<gadget id="calculator">(18/20)</gadget>
<output>9/10 = around 0.9</output>
0.9   Answer: Option 0.9
<result>E</result>
A pack of “Jameson's” cigarettes contains 20 cigarettes, of which 2 to 5 cigarettes (randomly) are defective. What are the greatest possible chances of picking a non-defective cigarette?