Use the Jacobi method to the system -5.9a1 + 1.9x2 = 1.1 0.2x1 - 7.1a2 = - 0.3 0.1 with Xo 0.1 1. The approximate solution X3 is 2. The posteriori error X3 using the lo norm is 3. The smallest integer number k such that ||X - X-1ll < 10-7 is