two urn contain respectively 3 white, 7 red, 15 black and 10 white ,6 red and 9 black balls. one ball is drawn from each urn. what is the probability that both ball are same colours
what is the probability that you will waste our time posting the same problem under three different subjects, without showing any of your own ideas?
Hint: Given that from the 1st urn, p(white) = 3/25 then p(white,white) = 3/25 * 10/25
Now do the same for the other colors, and add up the values. That will account for each of the three colors.