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The value of (30,0)(30,10)-(30,1)(30,11)...

The value of `(30,0)(30,10)-(30,1)(30,11)+(30,2)(30,12)-........+(30,20) (30,30)`, where `(n,r)=nC_r` is
a. `(30,10)`
b. `(30,15)`
c. `(60,30)`
d. `(31,10)`

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