Two marbles are drawn in succession from a box containing 10 red, 30 white, 20 blue and 15 orange marbles, with replacement after each draw. The probability that the first marble is red and the second is white, is
Solutions · 1
Official solution
Total marbles =75.
\[P = \frac{10}{75}\times\frac{30}{75} = \frac{4}{75}\]