Let 3;, 31-4 and n+1 he the probabilities of being in statm i, i 1 and i+1 respectively in the helm: gure _ Supp-nae we knew that we are starting in state i, 50 main) 2 1, $5400} 2 [I and 1:54.100} 2 I]. Write and solve the differential equations for an, :5,- 1 and 3;," 1. Why is iilgb an ac.- 1[t) the pmhahility Ti '1' r, i + ] infected