Jar A contains 2 tags numbered 1 and 2 respectively. Jar B also contains 2 tags numbered 1 and 2 respectively. Jar C contains 3 tags numbered 1, 2 and 3 respectively. We select 1 tag at random from A. Record the number as X1. We then select randomly X1 tags from B with replacement. Let X 2 be the total number on the tags drawn from B. We nally select X 2 tags randomly from C with replacement. Let X 3 be the total number on the tags drawn from C. Find E(X 3)