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JEE Advance - Mathematics (1982 - No. 29)

If $$x,\,y$$ and $$z$$ are $$pth$$, $$qth$$ and $$rth$$ terms respectively of an A.P. and also of a G.P., then $${x^{y - z}}\,{y^{z - x}}\,{z^{x - y}}$$ is equal to :
$$xyz$$
$$0$$
$$1$$
None of these

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