There are 10 white and 15 black balls in a box. Four balls are drawn from the box. What is the probability that all the drawn balls will be white?

#
There are $C_{25}^{4}$ ways to choose four balls. Of these, $C_{10}^{4}$ ways are suitable for us. Therefore, the desired probability is

$$
\frac{C_{10}^{4}}{C_{25}^{4}}=\frac{10 \cdot 9 \cdot 8 \cdot 7}{24 \cdot 23 \cdot 22 \cdot 21}
$$

## Answer

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