Box 1 contains 5 red and 6 blue marbles. Box 2 contains 4 red and 5 blue marbles. One marble is drawn at random from box 1 and dropped into box 2. A marble is then drawn at random from box 2 and dropped into box 1. A marble is now picked at random from box 1. Find the probability that the last marble drawn from box 1 is red.

1) 623/1210
2) 743/1320
3) 621/1210
4) None of the above