There are 24 children in a class, 16 brown-haired and 8 black-haired. Two students are randomly selected for a stage performance. Find the probability of the following selection. P (2 black haired children)

The answer is 7/69.

There are 8 black-haired children among 24 children. The probability of randomly selecting black haired children for the first time is:

P1 = 8/24 = 1/3

Now, there are 7 black-haired children left among 23 children. The probability of randomly selecting black haired children for the second time is:

P2 = 7/23

Since we want both of these events to occur together, we will multiply their probabilities:

P = P1 * P2 = 1/3 * 7/23 = 7/69