allb1659 allb1659

16-03-2018
Mathematics

contestada

How many ways can 5 sopranos and 4 altos be selected from 7 sopranos and 9 altos?

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MsEHolt MsEHolt

25-03-2018

They can be selected in 2646 ways.

[tex]_7C_5\times_9C_4=\frac{7!}{5!2!}\times\frac{9!}{4!5!}=21\times126=2646[/tex]

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