There are 9 cards numbered from 1 to 9 in box A, and 5 cards numbered from 1 to 5 in box B. A box is randomly chosen, and a card is drawn. If the card is an even number, another card is drawn from the same box; if the card is an odd number, a second card is drawn from the other box.Given that one card is odd and the other is even, what is the probability that they were drawn from box B