Question:
In a lottery, there are 10 prizes and 25 blanks. Find the probability of getting a prize.
Solution:
We know that,
Probability of occurrence of an event
$=\frac{\text { Total no.of Desired outcomes }}{\text { Total no.of outcomes }}$
Total no. of outcomes $=10+25=35$
Desired outcomes are prizes. Total no.of desired outcomes $=10$
Therefore, the probability of getting a prize $=\frac{10}{35}$
$=\frac{2}{7}$
Conclusion: Probability of getting a prize is $\frac{2}{7}$