Someone solve for me will mark the brainliest for explanation !

I'm terrible at math any here is appreciated.

In simplified exponential notation, the expression a^2•a^-3•a 1/a 0

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.