Question

1. Determine whether the situation is a permutation or a combination

(you are going to adopt two puppies from a litter of 7 puppies)
A)Permutation
B) combination
C) permutation and combination
D) none of the above
2. Determine whether the situation is a permutation or a combination
(you are going to arrange 7 books on a shelf)
A)Permutation
B) combination
C) permutation and combination
D) none of the above
3. Find the value of the expression: 7C5
A) 2
B)21
C)2520
D)5040
4. Gregg want to but 12 songs but can only afford 7. How many ways can he buy 7 songs out of 12?
A)3,991,680
B)95,040
C)792
D)84
A clothing store sells 10 different styles of men's shirts . How many way's can a costumer purchase 2 or 3 shirts?
A)45
B)120
C)252
D)165

Answer 1

1) B combination because you are choosing 2 randomly

2) A permutation because you are arranging them in an certain order

3) B 7!/(5!(7-5)!) = 21

4) C 12C7 = 12!/(7!(12-7)!) = 792

5) D 10!/(2!(10-2)!) + 10!/(3!(10-3)!) = 165

Answer 2

1-b cuz its describing numbers
2-A-prmation again
3-7C5 = 7!/(5!2!) = 7*6/2 = 21 so its B
4-792
5-d
hoped i helped