Four out of 9 performers will be chosen to stand in a row on stage. How many ways can the 4 performers stand in a row

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14-05-2020
Mathematics

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Four out of 9 performers will be chosen to stand in a row on stage. How many ways can the 4 performers stand in a row

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salatulmaghrib salatulmaghrib · Answer 1 · 2020-05-14T10:26:15+02:00

salatulmaghrib salatulmaghrib

14-05-2020

The number of ways to choose k items out of n items is:
[tex]\frac{n!}{n!(n-k)!}[/tex]

Plug in n as 9 and k as 4, and that's the answer:
[tex]\frac{9!}{4!(9-4)!} = 9*8*7*6*5/5/4/3/2 = 126[/tex]

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agarza9510 agarza9510 · Answer 2 · 2020-05-14T10:26:37+02:00

agarza9510 agarza9510

14-05-2020

Answer:

126

Step-by-step explanation:

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