1.	How many lines are determined by 7 points, no three of which are collinear?
		A.	42	B.	21
		C.	105	D.	200
		Hint
	2.	A briefcase combination lock contains 4 digits. Each digit is a number between 0 and 9. How many different combinations are possible if each number can only be used once?
		A.	10,000	B.	5,040
		C.	40	D.	7,200
		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 ways can a coach make a team of 18 players from a tryout of 20 people?
		A.	380	B.	3,420
		C.	6,840	D.	190
		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. If the students are chosen randomly, what is the probability that 6 seniors, 2 juniors, and 2 sophomores will be selected?
		A.		B.
		C.		D.
		Hint