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[" If "p,q,r" are positive integers and "omega" is the cube root of unity "],[" and "f(x)=x^(3p)+x^(3)q^(+1)+x^(3r+2)," then what is "f(omega)" equal to? "],[[" (a) "omega," (b) "-omega^(2)],[" (c) "-omega," (d) "0]]

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