If x ,y ,a n dz are pth, qth, and rth t...

If `x ,y ,a n dz` are pth, qth, and rth terms, respectively, of an A.P. nd also of a G.P., then `x^(y-z)y^(z-x)z^(x-y)` is equal to a.`x y z` b.` 0` c. `1 `d. none of these

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