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[" 19.Whe routs af unity "],[qquad " If ...

[" 19.Whe routs af unity "],[qquad " If "f(x)=|[x-3,2x^(2)-18,3x^(3)-81],[x-5,2x^(2)-50,4x^(3)-500],[1,2,3]" ,then "f(1)*f(3)+f(3)*f(5)+f(5)*f(1)" is equal to "],[[" (a) "f(1)," (b) "f(3)," (c) "f(1)+f(3)," (d) "f(1)+(15)]]

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