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

Answer 1

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.