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If `x+2\ a n d\ x-1` are the factors of `x^3+10 x^2+m x+n ,` then the values of `m\ a n d\ n` are respectively=? (a)`5\ a n d-3` (b) `17\ a n d-8` `7\ a n d-18` (d) `23\ a n d-19`

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