Statistics
posted by Rose .
3 balls are drawn successively from a box containing 6red,4 white and 5 blue balls.Find the probability that they are drawn in order red,white and blue if:(a)each ball is replaced.(b)balls are not replaced

If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events.
6/15 * 4/15 * 5/15 = ?
Without replacement, there is one less ball total in the following draws.
6/15 * 4/14 * 5/13 = ? 
one bag contains 4 white balls,2 black balls.another bag contains 3 white balls 5 black balls.if one ball is drawn from each bag. find that
a) both are white?
b) both are black?
c)one is white and one is black?