If C is a circle of radius r with centre z0 in the complex z-plane and if n is a non-zero integer, then $\oint_c \frac{dz}{(z - z_0)^{n+1}}$ equals
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If C is a circle of radius r with centre z0 in the complex z-plane and if n is a non-zero integer, then $\oint_c \frac{dz}{(z - z_0)^{n+1}}$ equals