1.	How many lines are determined by 7 points, no three of which are collinear?
		A.	200	B.	42
		C.	21	D.	105
		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.	40	B.	7,200
		C.	10,000	D.	5,040
		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.	360	B.	15
		C.	120	D.	30
		Hint
	5.	How many different ways can a coach make a team of 18 players from a tryout of 20 people?
		A.	3,420	B.	190
		C.	6,840	D.	380
		Hint