Level:
Project ID:
1003158406
Source Problem:
Accepted:
1
Clonable:
1
Easy:
0
A bag contains \( 10 \) white balls and \( 5 \) black balls. Two balls are drawn at random one by one without replacement. Find the probability that two black balls are drawn.
\( \frac2{21} \)
\( \frac2{15} \)
\( \frac14 \)
\( \frac19 \)