Question

For a segment of a radio showa DJ can play 7 records if there 9 records to choose from. In how many ways can the program for this segment be arranged? I have tried every way and cant seem to get the right answer... I need someone to help me showing me step by step...

Answer 1

sometimes it helps to think about a smaller problem. If you had to play 1 record of out 9 records, how many different selections can you make?

Hopefully(!) it is obvious you could select any of the 9 records.

Say you had to play 2 records out of the 9. You have 9 choices for the first record. How many for the 2nd record? There are 8 left, so 8 choices. 9*8= 72 different permutations.

Do you see the pattern yet?

Answer 2

i see it but 72 is the answer

Answer 3

For 3 records: 9*8*7
for 4 records: 9*8*7*6
etc....

Answer 4

so 9*8*7*6*5*4*3*2

Answer 5

I think that is for 8 records out of 9.

Answer 6

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Answer 8

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Answer 9

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Answer 12

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Answer 16

Uh Happy Birthday I guess? @ Saiyan

Answer 17

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Answer 19

math help, screenshot in comments. i know its either B or D, but im not sure which.

Answer 20

Happu bday Sayiannnnnnnnnnn

Answer 21

Happy Birthday, Saiyan e.e

Answer 22

math help, screenshot in comments

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Answer 24

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Answer 25

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