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Z \lbrace{nC_2}\rbrace is

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$Z \lbrace{nC_2}\rbrace$ Z \lbrace{nC_2}\rbrace is

$\frac{z}{(z-1)^3}$ \frac{z}{(z-1)^3}

$\frac{z}{(2z-1)^3}$ \frac{z}{(2z-1)^3}

$\frac{z(z-1)}{(z+1)^3}$ \frac{z(z-1)}{(z+1)^3}

$\frac{z(z+1)}{(z-1)^3}$ \frac{z(z+1)}{(z-1)^3}

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