Question

2 students are chosen at random from a group of 120 students that has 60 boys and 60 girls. What is the probability that the students are either both boys or both girls

Answer 1

If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events.

Both boys = 60/120 * 59/119 = ?

Same for both girls.

Either-or probabilities are found by adding the individual probabilities.