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  4. From 10,000 lottery tickets numbered from 1 to 10,000 one ticket is drawn at random. What is the probability that the number marked on the drawn ticket is divisible by 20

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Q. From $10,000$ lottery tickets numbered from $1$ to $10,000$ one ticket is drawn at random. What is the probability that the number marked on the drawn ticket is divisible by $20$

Probability

Solution:

Number of tickets numbered such that it is divisible by
$20$ are $\frac{10000}{20} = 500$
$\therefore $ required probability $= \frac{500}{10000}=\frac{1}{20}$