a bag contains 3 pink b***s and 4 green ball. Hannah picks a ball, at random from the bag abd then doesn't replace it, she then picks another ball at random. what is the probability that she pics a ball each colour?
+130536 The probability is given by :
[ C(3,1) * C(4,1) ] / C(7,2) = 4/7 = about 57%
Another way to see this is to take the probability of selecting a pink ball first and a green ball second = 3/7 * 4/6 and add this product to the probabilty of selecting a green ball first and a pink ball second = 4/7 * 3/6.....
