The selection problem of section 7 can be generalized by assuming that only the fraction 2 (0 < < 1) of the aa-class is eliminated. Show that = P u + v 1 - 9 More generally, (7.3) is to be replaced by Pn v + (1 - 2)w 1 - - 1 9n+1=-29 -29n. Pn+1 - 29 (The general solution of these equations appears to be unknown.)