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Anonymous User Best Answer
According to Roll theorm if a and b are root of f(x)= 0 then one root of f'(x) lie bw a and b f(x)=0 at x=1,2,3,4,5 According to Roll theorm root of f'(x)= 0 lie between (1,2)(2,3)(3,4)(4,5) So number of distinct root are 4