Three balls of masses `m_(1), m_(2)` and `m_(3)` are lying in a straight line. The first ball is moved with a certain velocity so that it strikes the second ball directly and itself comes to rest. The second ball collides with the third and is itself reduced to rest. If `e` is the coefficient of restitution for each ball, write down the relation of `m_(3)` in terms of `m_(1)` and `m_(2)`.