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enyata [817]
3 years ago
9

Evaluate C(7,5) please

Mathematics
2 answers:
wel3 years ago
8 0

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

nikklg [1K]3 years ago
4 0
21! Have a nice day and I hope this helped
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shepuryov [24]
<h2>Answer:</h2>

By Substitution Method

<h2>Step-by-step explanation:</h2>

Solve by Substitution :

We have two equations

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    y = 2x - 15  ------------> Equation 2


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