4.(c)   In a certain lottery    tickets are sold and ten equal prizes are awarded. What is the probability of not getting a prize if you buy (c)  
 tickets. 
                
                  Given, Total number of tickets sold = 10,000
Number of prizes awarded = 10
(c) If ten tickets are bought:
Number of tickets not awarded = 10000 - 10 = 9990
 P(not getting a prize) =