6.2.1

(i) Each trial of the experiment has only two possible mutually exclusive outcomes (or is defined in such a way that the number of outcomes is reduced to two). One outcome is denoted a success and the other a failure. (ii) There is a fixed number of trials, known in advance of the experiment. (iii) The experimental outcomes are independent of each other. (iv) The probability of observing a success remains the same from trial to trial.