True or false the order of magnitude for the population of the united states is 3

Which of the following are parts of a sphere

Successful implementation of a new system is based on three independent modules. module 1 works properly with probability 0.96. for modules 2 and 3, these probabilities equal 0.95 and 0.90. compute the probability that at least one of these three modules fails to work properly.

Just tell me how to set up the equation.