a)20.996 , 20.997 , 20.998, 20.999, 21.000, 21.001, 21.002, 21.003, 21.004, 21.005, 21.006, 21.007, 21.008 ,21.009
b)157.497 ,157.498, 157.499, 157.500, 157.501, 157.502, 157.503, 157.504, 157.505, 157.506, 157.507
c)999.991, 999.992, 999.993 ,999.994, 999.995, 999.996, 999.997, 999.998, 999.999, 1.000.000