. Consider a metropolitan area with uniform user density. A number of base stations are deployed throughout this area forming a uniform layout. Assume that there are n users to be serviced in the coverage region of each base station, and that each user consumes one frequency channel. In each cell, 5 channels are reserved for handoff purposes. The network operator considers two alternate designs: Design A and Design B. The cluster size in Design A is 4, and the cluster size in Design B is 7. The spectral efficiency in Design A is Pa= 1 bits/sec/Hz, and that in Design B is PB bits/sec/Hz. The total bandwidth that the network operator has is W Hz. . For what value of PB the two designs will provide the same rate (per user)