Question

Suppose a ball is drawn at random from a box containing three white and three black
balls. After a ball is drawn, it is then replaced and another drawn. What is the
probability that of the first four balls drawn, exactly two are white?

Answer 1

$Probability\; of \;getting\; white\; ball=\frac{3}{6}=0.5\\ P(X=2)=C_{2}^{4}(0.5)^{2}(0.5)^2=0.375$