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The roots of the equation |^x Cr^(n-1)Cr...

The roots of the equation `|^x C_r^(n-1)C_r^(n-1)C_(r-1)^(x+1)C_r^n C_r^n C_(r-1)^(x+2)C_r^(n+1)C_r^(n+1)C_(r-1)|=0` are a) `x=n` b) `x=n+1` c) `x=n-1` d) `x=n-2`

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