Question

How many ways can six books be arranged on a shelf?
A.21
B.120
C.360
D.720

Answer 1

I'll help

Answer 2

thanks

Answer 3

OKay would you like the answer or just how to get to the answer

Answer 4

the answer please

Answer 5

okay

Answer 6

720

Answer 7

start with your pile of 6 books:

choose 1 - you have 6 choices
after that you have 5 choices (so you have 6x5 ways = 30 you can choos e the first TWO books

there are 4 ways you can choose then ext

then 3 then 2 then 1

just multiply all the options together (6x5x.........)

Answer 8

can you help me with 3 more?

Answer 9

I'll try

Answer 10

@ArtemisWolf
You dis not 'help' him in any way with the last one. He only knows '720', and that YOU know how to get the answer. he does not know anything about how to calculate combinations and permutations

If you want to 'HELP' with 3 more then please refrain from giving answers - give methods and guidance but LET THE OP do the calculation .

Answer 11

there are eight girls competing in an ice-skating competition. In how many ways can they finish in first, second, and third place?
A.336
B.1,680
C. 2,016
D.40,320

Answer 12

How many ways can a president and vice president be selected from a class of 12?
A.23
B.72
C.132
D.1,320

Answer 13

How many ways can seven students line up for a class picture?
A.5,040
B.210
C.28
D.7

Answer 14

In each case look at the sequence

you can choose ANY of the originals for the FIRST choice ( so 8 options from th eskaeter)

then 7 then 6

just multiply all the options together

ALL 3 questions follow the same rule

Answer 15

d

Answer 16

for the first one second third or fourth?

Answer 17

@chaoticwolf

Answer 18

Try C & P the questions 1 at a time on google. Some people have already asked them on openstudy and you might get the answer there. Hope that helps! :)

Answer 19

thank you @MrNood for your help

Answer 20

You HAVE the answer above
8 choices forhte FIrst place
7 choices for second place
6 choices for 3rd place

MULTIPLY the choices to get your answer

12 choices for president
11 choices for VP

Multiply together

7 for first position
6 for second
5
4
3
2
1

MULTIPLY