allb1659 allb1659
  • 16-03-2018
  • Mathematics
contestada

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

Respuesta :

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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