2. Let \( X \) be the number of successful events in a sequence of \( N \) events. Each event is independent and has the probability of success "p". Find the probability mass function (pmf). (10%)
2. Let \( X \) be the number of successful events in a sequence of \( N \) events. Each event is independent and has the probability of success "p". Find the probability mass function (pmf). (10%)