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(1)
Find the value of “n” or “r”:
nCn-2 = 28
​

By Mackenzie

(1)
Find the value of “n” or “r”:
nCn-2 = 28
​

About the author
Mackenzie

Homework Sheet : 1
DATE:
Subject : English
A. Fill’s’or’an’:
1.
black bug
2.
large pool
3.

name the system under which Military Chief enjoys all the powers and suppress all the protests against him by the people​

2 thoughts on “(1)<br />Find the value of “n” or “r”:<br />nCn-2 = 28<br />​”

  2. Answer:

    n!/(n-2)!2! = 28

    n(n-1)(n-2)! /(n-2)! = 56

    n(n-1) = 56

    n2-n-56= 0

    n2-8n+7n-56=0

    n(n-8)+7(n-8) = 0

    (n+7)(n-8) = 0

    n = 7. r = 5

    n = 8. r = 6

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