kitycat9e kitycat9e
  • 26-02-2019
  • Mathematics
contestada

Evaluate C(7, 5).

21
42
1,008

Respuesta :

wegnerkolmp2741o
wegnerkolmp2741o wegnerkolmp2741o
  • 04-03-2019

Answer:

21

Step-by-step explanation:

This is a combination of 7 objects taken 5 at a time

nCr = n! / r! * (n - r)!

7C5 = 7! / (5! (7-5)!)

       = 7! /(5! 2!)

       = (7*6*5*4*3*2*1)

          -----------------------

          5*4*3*2*1  * 2*1

Canceling

      =    7*6/ (2*1)

      = 21

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