1.
If Z1,Z2,Z3Z_1, Z_2, Z_3 are 3 distinct complex numbers such that 3Z2−Z3=4Z3−Z1=5Z1−Z2\frac{3}{Z_2 - Z_3} = \frac{4}{Z_3 - Z_1} = \frac{5}{Z_1 - Z_2}, then the value of 9Z2−Z3+16Z3−Z1+25Z1−Z2\frac{9}{Z_2 - Z_3} + \frac{16}{Z_3 - Z_1} + \frac{25}{Z_1 - Z_2} equals