Markov Chains and absorption probabilites

Could someone please help me with this question?

A single-celled organism contains N particles, some of which are of type A, the others of

type B . The cell is said to be in state i , where http://latex.codecogs.com/png.latex?...0i%20\leq%20N$, if it contains exactly i particles

of type A. Daughter cells are formed by cell division, but rst each particle replicates itself;

the daughter cell inherits N particles chosen at random from the 2i particles of type A

and 2N-2i of type B in the parent cell.

Find the absorption probabilities and expected times to absorption for the case N = 3.

I have that the absorbing states are i=0 and i=3 but need help finding the transition matrix P