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| 1. |
If (1+x)^(n)=1+C_(1)x+C_(2)x^(2)+ . . .+C_(n)x^(n), then: C_(1)^(2)-2C_(2)^(2)+3C_(3)^(2)- . .. -2nC_(2n)^(2) is: |
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Answer» `N^(2)` |
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