1.) How many 4-bit binary strings are there?

A.)

8

B.)

32

C.)

4

D.)

16

2.)A particular brand of shirt has a male version and a female version, and comes in three sizes for each sex. How many different types of this shirt are made?

a)

5

b)

3

c)

6

d)

2

3.)How many different permutations are there of the set {a,b,c,d,e}?

a)

80

b)

40

c)

60

d)

120

4.) There are 6 runners participating a competition. In how many different orders can these runners finish a race if no ties are allowed?

a)

10

b)

120

c)

720

d)

60

5.) P(8, 4) = ?

a)

1680

b)

56

c)

32

d)	336 can you help me with these questions please .