During the first half of the week, drew burr picked 216 flowers. during the second half ,he picked hal that many. about how many total flower did he pick in al 300,350 or 400

Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?