A gas station that fills portable propane tanks (such as are used for camping and for outdoor barbecues) charges $2.50 per gallon.

Me. i can't figure out this question. give an explanation too. .

Answer for 10 points show work you guys in advanced < 3

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?