1.	The calculus class is preparing for the Advanced Placement Exam. If there are 12 girls in a class of 20, how many study groups of 3 girls and 2 boys can be formed?
		A.	110	B.	6160
		C.	8395	D.	5670
		Hint
	2.	How many lines are determined by 7 points, no three of which are collinear?
		A.	21	B.	42
		C.	105	D.	200
		Hint
	3.	A briefcase combination lock contains 4 digits. Each digit is a number between 0 and 9. If each number can only be used once, what is the probability that all four digits are odd?
		A.		B.
		C.		D.
		Hint
	4.	How many different two-person teams can be made from 6 people?
		A.	30	B.	15
		C.	360	D.	120
		Hint
	5.	A composition teacher needs to choose 10 students out of 15 to serve as rough draft reviewers. A group of 10 seniors, 3 juniors, and 2 sophomores have volunteered. How many different ways can the teacher choose 10 students?
		A.	360,360	B.	3,003
		C.	36,036	D.	133,133
		Hint