How many possible birth orders with respect to gender are possible in a family with four children? (for example, bbgg & ggbg are different orders) how many possible birth orders for a family with 4 children are there ?

For the chance to be team captain, the numbers 1-30 are put in a hat and you get two chances to pick a number, without replacement. which formula correctly shows how to find the probability that you choose the number 1 and then 2?