if c (n,a)=c (n,b);(anot equal then
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Answer:
As
n
C
9
=
n
C
8
9!(n−9)!
n!
=
8!(n−8)!
n!
9×8!(n−9)!
n!
=
8!(n−8)(n−9)!
n!
n−8=9
n=17
Then the value of
18
C
n
is,
18
C
17
=
17!(18−17)!
18!
=
17!
18×17!
=18
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