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Cnr(n>r≥1,n,r∈Z)恒等于( ) A. B. C. D.
C
nr(n>r≥1,n,r∈Z)恒等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224724377235933/SYS201311012247243772359005_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224724377235933/SYS201311012247243772359005_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224724377235933/SYS201311012247243772359005_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224724377235933/SYS201311012247243772359005_ST/3.png)
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