#### Answer

$\frac{1}{9}$

#### Work Step by Step

The events are independent:
P(B)=$\frac{3}{9}$=$\frac{1}{3}$ -3 of the 9 tiles are B's-
P(B and B)=P(B) $\times$ P(B)
P(B and B)=$\frac{3}{9}$ $\times$ $\frac{3}{9}$
P(B and B)=$\frac{9}{81}$
P(B and B)=$\frac{1}{9}$