Question of the Day 19-01-2019

The measurement system shown in the figure uses three sub-systems in cascade whose gains are specified as G₁,G₂ and $\frac{1}{G_3}$. The relative small errors associated with each respective subsystem G₁,G₂ and G₃ are ε₁,ε₂ and ε₃. The error associated with the output is: