# Balls

From the urn in which are 7 white balls and 17 red, gradually drag 3-times without replacement.

What is the probability that pulls balls are in order: red red red?

Correct result:

p =  33.6 %

#### Solution:

$p=100\%\cdot \dfrac{ 17-0}{ 7+17-0}\cdot \dfrac{ 17-1}{ 7+17-1}\cdot \dfrac{ 17-2}{ 7+17-2} = 33.6 \%$

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