(a) Reduce the block diagram to a single block. (Show your reduction steps.) (b) Apply Mason's gain formula to help you accomplish the same task as in part (a). R(s) + V₁(s) V₂(s) + V3(s) V4(s) + V5(s) C(s) G₁(s) G₂(s) G3(s) V₁(s) Vg(s) H₂(s) H3(5) V6($) H₁(s)