If α,β,γ are the zeroes of the polynomial f(x) = x^3-px^2+qx-r, then 1/αβ + 1/βγ + 1/γα = ?

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If α,β,γ are the zeroes of the polynomial f(x) = x^3-px^2+qx-r, then 1/αβ + 1/βγ + 1/γα = ?

RD SHARMA BOOK QUESTION CLASS 10
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Thanks sir, aap asi video or bhi Benao plz

pranjalisingh