2. In the above diagram, if |B| = 140, C| = 160, A N B = 30, JAN CI=40, JB N C = 35, JA UBU CI=380 and AnBn C = 25 then | A| = ? (4 points) Ans: 3. Find a recursive definition for CAT: A* XA* A* defined by CAT(s, t) = st (4 points) (Notice that A* is inductively defined. Basis: AEA": Induction: a A and XEA* imply ax e A) Ans