About 4% of children in the United States are allergic to peanuts. Choose three children at random and let the random variable X be the number in this sample who are allergic to peanuts. The possible values X can take are 0 , 1 , 2 , and 3 . What is the conditional probability that exactly two of the children will be allergic to peanuts, given that at least one of the three children suffers from this allergy