1003158406 | math4u.vsb.cz

SubArea:

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.

\frac{2}{21}

\frac{2}{15}

\frac{1}{4}

\frac{1}{9}