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09-10-2020
Mathematics

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In how many ways can you select a committee of four students of a group of nine students?

Respuesta :

09-10-2020

Answer:

126

Step-by-step explanation:

n! / (r! (n-r)!)

In this case n = 9 and r = 4

9!/ (4! * (9-4)!)

9!/ (4! * 5!)

= 126

9! = 9x8x7x6x5x4x3x2x1

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