Lauren works at a local animal shelter and writes posts for each pet for the animal shelter's social media accounts. Today the shelter has 6 dogs and 12 cats that she has not yet written posts for. Lauren has time to write 3 posts this morning and plans to randomly select the 3 pets at random. Find the probability of each of the following
a.The probability that the selection will include 2 dogs
b.The probability that the selection will include at least 2 dogs is