The probability that a molecule that collided with another molecule at time \(t=0\) and that did not experience any other collisions up to time \(t\) will experience a collision during the time interval between \(t\) and \(t+\Delta t\) is equal to \(\lambda \Delta t+o(\Delta t)\). Find the probability that the time of free motion (the time between two successive collisions) will be greater than \(t\).