A box contains 10 black and 10 white balls. What is the probability of drawing 2 balls of the same colour ?

A box contains 10 black and 10 white balls. What is the probability of

1.	A box contains 10 black and 10 white balls. What is the probability of drawing 2 balls of the same colour ?
A.	$\frac{9}{19}$$
B.	$\frac{9}{38}$$
C.	$\frac{10}{19}$$
D.	$\frac{5}{19}$$
E.	one of these
Answer» B. $\frac{9}{38}$$

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A box contains 10 black and 10 white balls. What is the probability of drawing 2 balls of the same colour ?

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