Let `f (x) ` be a polynomial of degree 5 with leading coefficient unity, such

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Let `f (x) ` be a polynomial of degree 5 with leading coefficient unity, such that `f (1) =5, f (2) =4, f (3) =3, f (4)=2 and f (5)=1,` then : Sum of the roots of `f (x)` is equal to :
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