In a certain lottery $10,000$ tickets are sold and ten equal prizes are awarded. What is the probability of not getting a prize if you buy one ticket.

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Total number of tickets sold $=10,000$

Number of prizes awarded $= 10$

If we buy one ticket, then $P($  getting a prize $)=\frac{10}{10000}=\frac{1}{1000}$

$\therefore$   $ P($ not getting a prize $)=1-\frac{1}{1000}=\frac{999}{1000}$

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