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1. In a lottery, there are 10 prizes and 25 blanks. A lottery is drawn at random. What is the probability of getting a prize?

A. $\frac{1}{10}$

B. $\frac{2}{5}$

C. $\frac{2}{7}$

D. $\frac{5}{7}$

Solution:

\begin{aligned} P (getting a prize) \\ = \frac{10}{10 + 25} \\ = \frac{10}{35} \\ = \frac{2}{7} \end{aligned}

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