The number of telephone call N between two cities A and B varies directly as the...

Question

The number of telephone call N between two cities A and B varies directly as the population PA, PB in A and B respectively and inversely as the square of the distance D between A and B. Which of the following equations represents this relation?

Options

A) \(N = \cfrac{kP_A}{D^2} + \cfrac{CP_B}{D^2}\)

B) \(N = \cfrac{kP_AP_B}{D^2}\)

C) \(N = kDP_AP_B\)

D) \(N = kDP_A + CDP_B\)

E) \(N = kD^2P_AP_B\)