Show that
(
)
1,
,
1
CnkCnkCnk
+ =
− +
.
Show that "C(n,k)=C(n,n-k)" :
"c(n,k)=\\frac{n!}{k!(n-k)!}=\\frac{n!}{(n-k)!(n-(n-k))!}=C(n,n-k)"
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