Answer
1) We want to know the number of successes after performing an experiment a certain number of times. This number must be fixed.
2) Each repetition is called a trial. The trials are independent from each other.
3) There are two possible outcomes: success or failure and $P(success~and~failure)=0$
4) The probability of a success in the first trial is equal to the probability of success of any other trial.
Work Step by Step
Given above.
