Ok, so when I try solved the attached problem I don't know how to come up with the right answer which is : 0.55858

My way of solving the problem is the following:

x=50 to infinity = 499(0.003)^2 (0.997)^498 + 500(0.003)^2(0.997)^499

Do I need to something like-> (0.003)^2(0.997)^498 / (1 - 0.997) ?